159 chapter 2=Descriptive Statistics - 2
1 1 0 ch2a 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc0 Displaying Data - Statistical Graphs
You use the data to create a stemplot graph by dividing each value into stem
and leaf.
A- true
B- false
C- no valid answer
2 1 0 ch2a 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc0 Displaying Data - Statistical Graphs
Graphs are the preferred visual representation of a sample distribution in
statistics?
A- true
B- false
C- no valid answer
3 1 0 ch2a 4 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc0 Displaying Data - Statistical Graphs
What is a preferred method of displaying data distribution in statistics?
A- graph
B- imaginary
C- on paper
4 0 0 ch2a 6 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc1 Displaying Data - Statistical Graphs
Which visual tool is used to learn about the shape of a data distribution in
statistics?
A- graphs
B- Greek letters
C- bright colors
D- maps
5 1 0 ch2a 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc1 Displaying Data - Statistical Graphs
A statistical graph is an excellent visual tool to help you learn how a
distribution is spread out.
A- true
B- false
C- no valid answer
6 0 0 ch2a 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc2 Displaying Data - Statistical Graphs
What are the two kinds of graphs most often used in statistics?
A- boxplot and histogram
B- molecular and atomic structure
C- muscular and skeletal diagram
D- bar chart and webshots
7 1 0 ch2a 5 B
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc2 Displaying Data - Statistical Graphs
In statistics, the emphasis is on two other kinds of graphs, the boxplot
and the cardiogram.
A- true
B- false
C- no valid answer
8 0 0 ch2a 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc3 Displaying Data - Statistical Graphs
What statistical graph comes from the field of exploratory data analysis?
A- stem-and-leaf graph
B- cardiograph
C- bar chart
D- celestial sphere
9 1 0 ch2a 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc3 Displaying Data - Statistical Graphs
A stem-and-leaf graph or stemplot comes from the field of exploratory data
analysis.
A- true
B- false
C- no valid answer
10 2 0 ch2a 4 C
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc3 Displaying Data - Statistical Graphs
What statistical graph comes from the field of exploratory data analysis?
A- histogram
B- boxplot
C- stemplot
11 0 0 ch2a 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc4 Displaying Data - Statistical Graphs
When is a stemplot graph a good choice to represent data?
A- data set is small
B- data is skewed
C- data is widely spread
D- data set is not available
12 1 0 ch2a 4 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc4 Displaying Data - Statistical Graphs
The stemplot is a good choice if the data set is small?
A- true
B- false
C- no valid answer
13 0 0 ch2a 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc5 Displaying Data - Statistical Graphs
How is each data point divided in a stemplot graph?
A- into stem and leaf
B- by number of observations minus one
C- into even values and odd values
D- by the sample variance
14 1 0 ch2a 4 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc5 Displaying Data - Statistical Graphs
You use the data to create the stemplot by dividing them into stem and leaf.
A- true
B- false
C- no valid answer
15 0 0 ch2a 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc6 Displaying Data - Statistical Graphs
In a stemplot graph, what portion of a number goes into the stem?
A- first digit
B- divider
C- modulus
D- last digit
16 1 0 ch2a 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc6 Displaying Data - Statistical Graphs
The leaf consists of the last digit and the stem consists of the remaining
in a stemplot.
A- true
B- false
C- no valid answer
17 0 0 ch2a 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc6 Displaying Data - Statistical Graphs
For 84, what is the value that goes into the stem in a stemplot
A- 8
B- 4
C- 2
D- none
18 1 0 ch2a 4 B
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc6 Displaying Data - Statistical Graphs
In the value 84, the 4 goes into the stem of a stemplot.
A- true
B- false
C- no valid answer
19 2 0 ch2a 4 C
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc6 Displaying Data - Statistical Graphs
For 84, what is the value that goes into the stem in a stemplot?
A- 84
B- none
C- 8
20 0 0 ch2a 6 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc6 Displaying Data - Statistical Graphs
For 84, what is the value that goes into the leaf in a stemplot
A- 4
B- 8
C- 2
D- 0
E- nothing
21 0 0 ch2a 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc6 Displaying Data - Statistical Graphs
For 84, what is the value that goes into the stem in a stemplot?
A- 8
B- 4
C- 2
D- none
22 1 0 ch2a 4 B
John Petroff=staff #1 2005-08-18; John Petroff=staff#1 2005-08-18
ch/ch2aanc6 The leaf consists of one digit and the stem consists of the remaining digits. For
In the value 84, the 4 goes into the stem of a stemplot.
A- true
B- false
C- no valid answer
23 1 0 ch2a 4 B
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc6 Displaying Data - Statistical Graphs
For 84, what is the value that goes into the stem in a stemplot?
A- 4
B- 8
C- 0
24 0 0 ch2a 6 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc6 Displaying Data - Statistical Graphs
For 84, what is the value that goes into the leaf in a stemplot?
A- 4
B- 8
C- 2
D- 0
E- nothing
25 1 0 ch2a 5 C
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc6 Displaying Data - Statistical Graphs
For 84, what is the value that goes into the leaf in a stemplot?
A- 0
B- 8
C- 4
D- 84
26 0 0 ch2a 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc7 Displaying Data - Statistical Graphs
What does a stemplot graph shows for a given grades distribution?
A- most scores fell in the 60s, 70s or 80s,
B- first and third quartile
C- median score
D- standard deviation of scores
27 0 0 ch2a 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc8 Displaying Data - Statistical Graphs
What does a boxplot represent well?
A- how far extreme values are from the rest of the distribution
B- the regression line
C- stem and leaf of each value
D- standard deviation of distribution
28 0 0 ch2a 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc8 Displaying Data - Statistical Graphs
What is another name of the box-whisker plot?
A- boxplot
B- stemplot
C- histrogram
D- cardiogram
29 1 0 ch2a 5 C
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc8 Displaying Data - Statistical Graphs
What is another name of the box-whisker plot?
A- Card
B- Scoreplot
C- Boxplot
D- No valid answer
30 0 0 ch2a 6 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc8 Displaying Data - Statistical Graphs
What graph is used for a good graphical image of how far are extreme values
from the rest of the distribution?
A- boxplot or box-whisker
B- exponential distribution
C- logarithmic table
D- first differentiation values
31 0 0 ch2a 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc9 Displaying Data - Statistical Graphs
What are the five values shown in a boxplot?
A- smallest, first quartile, median, third quartile and largest
B- smallest, first quartile, mean, third quartile and largest
C- smallest, standard deviation, mean, variance and largest
D- smallest, standard deviation, median, variance and largest
32 1 0 ch2a 5 B
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc9 Displaying Data - Statistical Graphs
A boxplot contains the smallest value, first quartile, mean, third quartile and
largest value.
A- true
B- false
C- no valid answer
33 0 0 ch2a 6 D
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc9 Displaying Data - Statistical Graphs
What graph gives smallest value, first quartile, median, third quartile
and largest value?
A- Steam and leaf
B- Boxplot
C- Box-Whisker Plot
D- B & C
34 0 0 ch2a 6 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc10 Displaying Data - Statistical Graphs
What graphical representation is used for a quick visualization to compare at
least two groups of values?
A- boxplot
B- normal distribution
C- histogram
D- stem and leaf
35 1 0 ch2a 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc10 Displaying Data - Statistical Graphs
The boxplot is used mostly as a quick visualization to compare at least two
groups of statistics.
A- true
B- false
C- no valid answer
36 0 0 ch2a 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc11 Displaying Data - Statistical Graphs
Which statistical graph is made of contiguous boxes?
A- histogram
B- frequency table
C- cardiogram
D- boxplot
37 3 0 ch2a 5 B
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc11 Displaying Data - Statistical Graphs
Which statitical graph is made of contiguous boxes?
A- Boxplot
B- Histogram
C- Steam and leaf
D- No valid answer
38 0 0 ch2a 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc11 Displaying Data - Statistical Graphs
What does a histogram consist of?
A- continuous boxes
B- a table of five values
C- a column data value facing a column frequencies
D- two dimensional scatter diagram
39 0 0 ch2a 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc12 Displaying Data - Statistical Graphs
What goes in the horizontal axis of a histogram?
A- data values
B- frequencies
C- deviations
D- squared deviations
40 1 0 ch2a 4 B
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc12 Displaying Data - Statistical Graphs
Relative frequencies appear on the horizontal axis of histograms.
A- true
B- false
C- no valid answer
41 0 0 ch2a 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc12 Displaying Data - Statistical Graphs
What goes in the vertical axis of a histogram?
A- relative frequencies
B- data values
C- deviations
D- squared deviations
42 3 0 ch2a 5 B
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc12 Displaying Data - Statistical Graphs
What goes in the vertical axis of a histogram?
A- Data
B- Frequencies
C- Lower endpoint
D- Upper endpoint
43 0 0 ch2a 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc13 Displaying Data - Statistical Graphs
What does the histogram show?
A- the shape of the distribution
B- five critical values
C- stem and leaf values
D- the extreme values
44 0 0 ch2a 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc13 Displaying Data - Statistical Graphs
What statistical graph is especially good at showing where data is concentrated?
A- histogram
B- boxplot
C- table of extreme values
D- cardiogram
45 0 0 ch2a 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc13 Displaying Data - Statistical Graphs
What statistical graph is especially good at showing if data is skewed?
A- histogram
B- celestial map
C- skeletal diagram
D- box-whisker plot
46 3 0 ch2a 5 B
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc13 Displaying Data - Statistical Graphs
What statistical graph is especially good at showing if data is skewed?
A- celestial map
B- histogram
C- box-whisker plot
D- skeletal diagram
47 0 0 ch2a 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc14 Displaying Data - Statistical Graphs
Intervals of a histogram are chosen so that they reveal?
A- trend
B- extreme values
C- median value
D- variance
48 0 0 ch2a 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc17 Displaying Data - Statistical Graphs
What problem arises when too few intervals are chosen in a histogram?
A- the data is clumped together
B- the data is too spread out
C- extreme values are oversized
D- not all data is included in calculation
49 1 0 ch2a 4 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc17 Displaying Data - Statistical Graphs
Too few bars in a histogram clump all the data together?
A- true
B- false
C- no valid answer
50 0 0 ch2a 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc17 Displaying Data - Statistical Graphs
What problem arises when too many intervals are chosen in a histogram?
A- trend is not noticeable
B- dat clumped together
C- too many values are omitted
D- emphasis on outliers
51 1 0 ch2a 4 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc17 Displaying Data - Statistical Graphs
Too many bars make trend difficult to observe in a histogram.
A- true
B- false
C- no valid answer
52 0 0 ch2a 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2aanc18 Displaying Data - Statistical Graphs
What is the purpose of a histogram?
A- reveal shape and trend in a distribution
B- reveal outliers
C- show extreme values
D- show quartile and median values
53 0 0 ch2b 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2banc0 Quartiles divide into quarters a set of data ordered from smallest to largest.
What is the name given to one quarter of a set of data?
A- quartile
B- decimal
C- percent
D- forthright
54 1 0 ch2b 4 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2banc0 Quartiles divide into quarters a set of data ordered from smallest to largest.
Quartiles divide into quarters a set of data ordered from smallest to largest.
A- true
B- false
C- no valid answer
55 3 0 ch2b 5 B
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2banc0 Quartiles divide into quarters a set of data ordered from smallest to largest.
What is the name given to one quarter of a set of data?
A- Decile
B- Quartile
C- Percentiles
D- Median
56 0 0 ch2b 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2banc1 The value that divides the set in halves is called the second quartile (Q2). The second quartile,
What is the quartile that divides a set of data into halves?
A- median
B- variance
C- t-statistic
D- mean
57 1 0 ch2b 4 B
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2banc1 The value that divides the set in halves is called the second quartile (Q2). The second quartile,
The value that divides the set in halves is called the second percent?
A- true
B- false
C- no valid answer
58 0 0 ch2b 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2banc2 The value that divides the lower half into halves is called the first quartile (Q1).
What is the quartile that divides the lower half into halves?
A- first
B- second
C- third
D- any quartile
59 0 0 ch2b 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2banc3 The value that divides the upper half into halves is called the third quartile (Q3).
What is the quartile that divides the upper half into halves?
A- third
B- second
C- first
D- any quartile
60 0 0 ch2b 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2banc4 Percentiles divide into hundredths a set of data ordered from smallest to largest.
What is the name of one hundredth of a set of data?
A- percentile
B- quartile
C- fractional value
D- cumulative frequency
61 1 0 ch2b 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2banc4 Percentiles divide into hundredths a set of data ordered from smallest to largest.
Percentiles divide into hundreds a set of data ordered from smallest to
largest.
A- true
B- false
C- no valid answer
62 3 0 ch2b 5 B
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2banc4 Percentiles divide into hundredths a set of data ordered from smallest to largest.
What is the name of one hundredth of a set of data?
A- Quartile
B- Percentile
C- Median
D- Tens
63 0 0 ch2b 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2banc5 A measure that is often used to find the range of the middle 50% of the data is called the
What is the name given to the middle 50% range of set of data?
A- interquartile range
B- extreme values
C- outliers
D- interpercentile range
64 1 0 ch2b 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2banc5 A measure that is often used to find the range of the middle 50% of the data is called the
A measure that is often used to find the range of the middle 50% is the
interquartile range.
A- true
B- false
C- no valid answer
65 0 0 ch2b 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2banc6 The Interquartile Range is defined as the difference between the third and first quartiles.
How is the interquartile range calculated?
A- difference between the third and first quartile
B- difference between the first and third quartile
C- difference between median and third quartile
D- difference between mean and variance
66 1 0 ch2b 5 B
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2banc6 The Interquartile Range is defined as the difference between the third and first quartiles.
The Interquartile Range is defined as the difference between the mean
and the variance.
A- true
B- false
C- no valid answer
67 0 0 ch2b 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2banc7 The IQR can help to determine outliers. A value is suspected to be an outlier if it is more than (1.
What is the purpose of the interquartile range?
A- determine outliers
B- reveal trend
C- shows skewness
D- necessary to calculate varianc
68 1 0 ch2b 4 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2banc7 The IQR can help to determine outliers. A value is suspected to be an outlier if it is more than (1.
The IQR can help to determine outliers.
A- true
B- false
C- no valid answer
69 0 0 ch2b 6 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2banc7 The IQR can help to determine outliers. A value is suspected to be an outlier if it is more than (1.
What can be said about a value in a set of data, that is beyond one and
a half times the interquartile range?
A- it is an outlier
B- it is close to the mean
C- it is equal to the standard deviation
D- its deviation is zero
70 0 0 ch2c 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2canc0 The mean is the same as the average.
What is the statistic which is exactly the same as an average?
A- mean
B- first quartile
C- standard deviation
D- variance
71 1 0 ch2c 4 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2canc0 The mean is the same as the average.
The mean is the same as the average.
A- true
B- false
C- no valid answer
72 1 0 ch2c 5 D
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2canc0 The mean is the same as the average.
What is the statistic which is exactly the same as an average?
A-Mean
B- Second Quartile
C- 50%
D- All of them
73 0 0 ch2c 6 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2canc1 The mean is the same as the average.
What is name of the statistic which is given by dividing the total of all
values in a set of observations, by the number of observations?
A- mean
B- standard deviation
C- variance
D- t-statistic
74 1 0 ch2c 4 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2canc1 The mean is the same as the average.
To find the mean, add all the values and divide by the total number of values.
A- true
B- false
C- no valid answer
75 1 0 ch2c 7 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2canc1 The mean is the same as the average.
What is name of the statistic which is given by dividing the total of all
values
in a set of data, by the number of those values?
A- Mean
B- Standard Deviation
C- Quartile
D- Steam and Leaf
76 0 0 ch2c 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2canc1 The mean is the same as the average.
How do you calculate the mean of a distribution?
A- add all the values, and divide by the number of values
B- add all the deviations, and divide by the number of deviations
C- add all squared deviations, and divide by the number of deviations
D- add all outliers, and divide by the interquartile range
77 0 0 ch2c 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2canc2 The letter x with a bar over it,
What does x with a bar over it stand for?
A- sample mean
B- sample median
C- population median
D- population variance
78 1 0 ch2c 4 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2canc2 The letter x with a bar over it,
The letter x with a bar over it stands for sample data mean.
A- true
B- false
C- no valid answer
79 1 0 ch2c 5 C
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2canc2 The letter x with a bar over it,
What does x with a bar over it stand for?
A- Median
B- Standard Deviation
C- Sample Mean
D- Sample Question
80 0 0 ch2c 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2canc2 The letter x with a bar over it,
How is the mean of a data sample represented in statistics?
A- letter x with a bar over it
B- Greek letter sigma
C- capital M
D- P(A)
81 0 0 ch2c 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2canc3 The Greek letter, µ , represents the population mean.
What Greek letter represents the mean of a population?
A- µ
B- delta
C- sigma
D- epsilon
82 1 0 ch2c 4 B
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2canc3 The Greek letter, µ , represents the population mean.
The Greek letter, µ , represents the population standard deviation.
A- true
B- false
C- no valid answer
83 0 0 ch2c 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2canc3 The Greek letter, µ , represents the population mean.
What does µ stand for?
A- population mean
B- sample mean
C- population mode
D- sample mode
84 1 0 ch2c 4 B
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2canc3 The Greek letter, µ , represents the population mean.
The Greek letter, µ , represents the sample mean.
A- true
B- false
C- no valid answer
85 0 0 ch2c 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2canc3 The Greek letter, µ , represents the population mean.
What is the difference between µ and x with a bar over it?
A- µ represents the entire population, not x bar
B- µ is calculated based on sample values, not x bar
C- µ is raised to the second power, not x bar
D- µ is is a fraction, not x bar
86 0 0 ch2c 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2canc4 The median is the middle value of a set of numbers that has been ordered from smallest to largest.
What is the name given to the middle value of a set of numbers?
A- median
B- center
C- mode
D- mean
87 1 0 ch2c 4 B
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2canc4 The median is the middle value of a set of numbers that has been ordered from smallest to largest.
The mode is the middle value of a set of numbers.
A- true
B- false
C- no valid answer
88 3 0 ch2c 5 B
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2canc4 The median is the middle value of a set of numbers that has been ordered from smallest to largest.
What is the name given to the middle value of a set of numbers?
A- Mode
B- Median
C- Mean
D- Q4
89 0 0 ch2c 5 A
John Petroff=staff #1 2005-08-18; Andrei Manole=faculty#6091 2011
ch/ch2canc4 The median is the middle value of a set of numbers that has been ordered from smallest to largest.
Give the definition of median.
A- middle value of a set of numbers
B- average of a set of numbers
C- most frequent value in a set of numbers
D- difference between third and first quartile
90 0 0 ch2c 5 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2canc5 The upper case letter M is used for the median.
How is the median represented in statistics?
A- The upper case letter M is used for the median.
B- With a Greek letter
C- €
D- B and C
91 1 0 ch2c 4 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2canc5 The upper case letter M is used for the median.
The upper case letter M is used for the median.
A- true
B- false
C- no valid answer
92 3 0 ch2c 5 B
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2canc5 The upper case letter M is used for the median.
How is the median represented in statistics?
A- •
B- M
C- A
D- V
93 0 0 ch2c 5 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2canc6 The median is between 7th and 8th values (the middle two values).
How is the median calculated if it falls in between two values?
A- The median is between 7th and 8th values (the middle two values).
B- The 7th value
C- The 8th value
D- The 1st and the last value
94 1 0 ch2c 4 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2canc6 The median is between 7th and 8th values (the middle two values).
The median is between 7th and 8th values (the middle two values).
A- true
B- false
C- no valid answer
95 1 0 ch2c 5 C
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2canc6 The median is between 7th and 8th values (the middle two values).
How is the median calculated if it falls in between two values?
A- The 1st value
B- The last value
C- Between the 7th and 8th value
D- Between the first and last value
96 0 0 ch2c 5 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2canc7 The mode is the most frequent value in the set of numbers.
What is the name used for the most frequent value in a set of numbers?
A- The mode is the most frequent value in the set of numbers.
B- The mean is the most frequent value in the set of numbers.
C- The median is the most frequent value in the set of numbers.
D- The decile is the most frequent value in the set of numbers.
97 1 0 ch2c 4 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2canc7 The mode is the most frequent value in the set of numbers.
The mode is the most frequent value in the set of numbers.
A- true
B- false
C- no valid answer
98 1 0 ch2c 5 B
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2canc7 The mode is the most frequent value in the set of numbers.
What is the name used for the most frequent value in a set of numbers?
A- Median
B- Mode
C- Mean
D- Set
99 0 0 ch2c 5 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2canc7 The mode is the most frequent value in the set of numbers.
Give definition of mode.
A- The mode is the most frequent value in the set of numbers.
B- The mode is the middle value in a set of numbers.
C- The mode is the sample mean.
D- The mode is an abstract term.
100 1 0 ch2c 4 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2canc7 The mode is the most frequent value in the set of numbers.
The mode is the most frequent value in the set of numbers.
A- true
B- false
C- no valid answer
101 0 0 ch2c 5 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2canc7 The mode is the most frequent value in the set of numbers.
Give definition of mode.
A- Most frequent value in a set of numbers.
B- Most highest number.
C- Most smallest number.
D- Most ugly number.
102 0 0 ch2c 5 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2canc8 We call this set of data bimodal, meaning it has two modes.
What do you call a distribution which has two modes?
A- We call this set of data bimodal, meaning it has two modes.
B- We call this set of data two-modal,meaning it has two modes.
C- We call this set of data second-modal,meaning it has two modes.
D- We call this set of data trimodal,meaning it has two modes.
103 1 0 ch2c 4 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2canc8 We call this set of data bimodal, meaning it has two modes.
We call this set of data bimodal, meaning it has two modes.
A- true
B- false
C- no valid answer
104 1 0 ch2c 5 B
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2canc8 We call this set of data bimodal, meaning it has two modes.
What do you call a distribution which has two modes?
A- Two-modal
B- Bimodal
C- Second-modal
D- Trimodal
105 0 0 ch2c 5 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2canc9 Which is the "best" measure of the center of a set of data? That all depends on the data.
What are the three statistics that are used to represent the center of a set of data?
A- Median,mode,mean
B- Mean,mode,second quartile
C- Mode,median,first percentile
D- Mean,median,third decile
106 1 0 ch2c 4 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2canc9 Which is the "best" measure of the center of a set of data? That all depends on the data.
The "best" measure of the center of a set of data is to use the mode,median or mean?
A- true
B- false
C- no valid answer
107 1 0 ch2c 5 B
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2canc9 Which is the "best" measure of the center of a set of data? That all depends on the data.
What are the three statistics that are used to represent the "best" measure of a center of a set of data?
A- All quartiles
B- Median,mode,mean
C- Median,mean,quartiles
D- Mode,mean,decile
108 0 0 ch2c 5 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2canc9 Which is the "best" measure of the center of a set of data? That all depends on the data.
Is there one statistic, mean, median or mode that is always the best measure of a center of a set of data?
A- All three of them,depending on the situation.
B- Only two of them,mean and median.
C- Only two of them,mode and mean.
D- Only one,mean,no matter the case.
109 1 0 ch2c 4 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2canc9 Which is the "best" measure of the center of a set of data? That all depends on the data.
The median,mode or mean are one of the "best" measures of the center of a set of data?
A- true
B- false
C- no valid answer
110 1 0 ch2c 4 B
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2canc9 Which is the "best" measure of the center of a set of data? That all depends on the data.
Is there one statistic, mean, median or mode that is always the best measure?
A- Yes
B- No
C- No valid answer
111 1 0 ch2c 6 C
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2canc10 different values with no extremely large or small values, the mean might be the best measure
Which is the best representation of the center of a set of numbers if there are no different values with no extremely large or
small values?
A- Median
B- Mode
C- Mean
D- Deviation
112 1 0 ch2c 4 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2canc10 different values with no extremely large or small values, the mean might be the best measure
If the data tends toward being different values with no extremely large or small values, the best measure is the mean.
A- true
B- false
C- no valid answer
113 0 0 ch2c 5 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2canc10 different values with no extremely large or small values, the mean might be the best measure
Which is the best representation of the center of a set of numbers if the data repeats?
A- Mode
B- Mean
C- Median
D- No valid answer
114 0 0 ch2c 5 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2canc11 skewed, the median might be the best measure of the center.
What is the best representation of the center of a set of numbers if the data is highly skewed?
A- the median
B- the mode
C- the mean
D- the percentile
115 1 0 ch2c 4 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2canc11 skewed, the median might be the best measure of the center.
If the data is highly skewed, the median might be the best measure of the center.
A- true
B- false
C- no valid answer
116 0 0 ch2c 5 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2canc11 skewed, the median might be the best measure of the center.
What is the best representation of the center of a set of numbers if the data is skewed?
A- Median
B- Mean
C- Mode
D- None of the above
117 0 0 ch2d 5 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc0 The variance is the average of the squares of the deviations.
What statistics is obtained by taking the average of squared
A- The variance is the average of the squares of the deviations.
B- The variance is the average of the squares of the mode.
C- The variance is the average of the squares of the mean.
D- The variance is the average of the squares of the median.
118 1 0 ch2d 4 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc0 The variance is the average of the squares of the deviations.
The variance is the average of the squares of the deviations.
A- true
B- false
C- no valid answer
119 1 0 ch2d 5 C
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc0 The variance is the average of the squares of the deviations.
What statistics is obtained by taking the average of squared deviations?
A- Mode
B- Median
C- Variance
D- Covariance
120 0 0 ch2d 5 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc0 The variance is the average of the squares of the deviations.
What is the definition of variance?
A- The variance is the average of the squares of the deviations.
B- The variance is the average of the squares of the mean.
C- The variance is the average of the squares of the median.
D- The variance is the average of the squares of the mode.
121 1 0 ch2d 4 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc0 The variance is the average of the squares of the deviations.
The variance is the average of the squares of the deviations.
A- true
B- false
C- no valid answer
122 0 0 ch2d 5 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc0 The variance is the average of the squares of the deviations.
What is the definition of variance?
A- The average of the squares of the deviations.
B- The average of the squares of the quartiles.
C- The average of the squares of the percentiles.
D- The average of the squares of the sums.
123 0 0 ch2d 5 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc1 A deviation is the difference between a value and the mean, and is written as:
How is deviation calculated?
A- A deviation is the difference between a value and the mean.
B- A deviation is the difference between a value and the mode.
C- A deviation is the difference between a value and the median.
D- A deviation is the difference between a value and the deviations.
124 1 0 ch2d 4 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc1 A deviation is the difference between a value and the mean, and is written as:
A deviation is the difference between a value and the mean.
A- true
B- false
C- no valid answer
125 3 0 ch2d 5 D
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc1 A deviation is the difference between a value and the mean, and is written as:
How is deviation calculated?
A- The difference between a value and the mode.
B- The difference between a value and the median.
C- The difference between a value and the decils.
D- The difference between a value and the mean.
126 0 0 ch2d 5 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc1 A deviation is the difference between a value and the mean, and is written as:
What is the difference between the value of a set of numbers and the mean?
A- A deviation is the difference between a value and the mean.
B- A deviation is the difference between a value and the median.
C- A deviation is the difference between a value and the mode.
D- A deviation is the difference between a value and the quartiles..
127 1 0 ch2d 4 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc1 A deviation is the difference between a value and the mean, and is written as:
A deviation is the difference between a value and the mean.
A- true
B- false
C- no valid answer
128 3 0 ch2d 5 D
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc1 A deviation is the difference between a value and the mean, and is written as:
What is the difference between the value of a set of numbers and the mean?
A- A mode
B- A median
C- A mean
D- A deviation
129 3 0 ch2d 5 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc2 We divide by 3 instead of 4 because, if we add all the deviations
What is the sum of all deviations in a set of numbers?
A- We divide by 3 instead of 4 because, if we add all the deviations the sum is zero.
B- We divide by 2 instead of 4 because, if we add all the deviations the sum is zero.
C- We divide by 5 instead of 4 because, if we add all the deviations the sum is zero.
D- We divide by 3 instead of 4 because, if we add all the deviations the multiplication is zero.
130 1 0 ch2d 4 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc2 We divide by 3 instead of 4 because, if we add all the deviations
We divide by 3 instead of 4 because if we add all the deviations their sum is 0.
A- true
B- false
C- no valid answer
131 3 0 ch2d 5 D
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc2 We divide by 3 instead of 4 because, if we add all the deviations
What is the sum of all deviations in a set of numbers?
A- A quartilr
B- A mode
C- A mean
D- Zero
132 0 0 ch2d 5 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc2 We divide by 3 instead of 4 because, if we add all the deviations
By what number is the sum of squared deviations divided?
A- We divide by 3 instead of 4 because, if we add all the deviations the sum is zero.
B- We divide by 2 instead of 4 because, if we add all the deviations the sum is zero.
C- We divide by 0 instead of 4 because, if we add all the deviations the sum is zero.
D- We divide by 1 instead of 4 because, if we add all the deviations the sum is zero.
133 1 0 ch2d 4 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc2 We divide by 3 instead of 4 because, if we add all the deviations
We divide by 3 instead of 4 because, if we add all the deviations the sum is zero.
A- true
B- false
C- no valid answer
134 1 0 ch2d 5 B
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc2 We divide by 3 instead of 4 because, if we add all the deviations
By what number is the sum of squared deviations divided?
A- 6
B- 3
C- 0
D- 4
135 0 0 ch2d 5 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc3 Knowing 3 of the deviations determines the 4th one. Only 3 of the squared deviations can vary
In a set of four values how can we determine the 4th one?
A- Knowing 3 of the deviations determines the forth.
B- Knowing 2 of the deviations determines the forth.
C- Knowing 1 of the deviations determines the forth.
D- Knowing 5 of the deviations determines the forth.
136 1 0 ch2d 4 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc3 Knowing 3 of the deviations determines the 4th one. Only 3 of the squared deviations can vary
Knowing 3 of the deviations determines the 4th.
A- true
B- false
C- no valid answer
137 0 0 ch2d 4 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc3 Knowing 3 of the deviations determines the 4th one. Only 3 of the squared deviations can vary
In a set of four values where three of the deviations are known we can determine the forth?
A- True
B- False
C- No valid answer
138 0 0 ch2d 5 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc4 The number 3 is called the degrees of freedom of the variance.
What is the name given to the number of the degrees of freedom of the variance?
A- The number 3 is called the degrees of freedom of the variance.
B- The number 4 is called the degrees of freedom of the variance.
C- The number 5 is called the degrees of freedom of the variance.
D- The number 2 is called the degrees of freedom of the variance.
139 1 0 ch2d 4 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc4 The number 3 is called the degrees of freedom of the variance.
The number 3 is called the degrees of freedom of the variance.
A- true
B- false
C- no valid answer
140 1 0 ch2d 5 B
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc4 The number 3 is called the degrees of freedom of the variance.
What is the name given to the Greek letter σ?
A- Sample variance
B- Population variance
C- Third population
D- Simple variance
141 0 0 ch2d 5 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc5 For a population variance, divide by the total number of values in the population.
How to obtain the variance of an entire population?
A- For a population variance, divide by the total number of values in the population.
B- For a population variance, divide the first half of the total number of values in the population.
C- For a population variance, divide the second half of the total number of values in the population.
D- For a population variance, divide the middle number of values in the population.
142 1 0 ch2d 4 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc5 For a population variance, divide by the total number of values in the population.
For a population variance, divide by the total number of values in the population.
A- true
B- false
C- no valid answer
143 0 0 ch2d 5 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc5 For a population variance, divide by the total number of values in the population.
To obtain the variance of an entire population you must:
A- divide by the total number of values in the population.
B- divide by the odd number of values in the population.
C- divide by the even number of values in the population.
D- divide by the raw number of values in the population.
144 0 0 ch2d 5 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc6 The sample variance is represented by
How is a sample variance represented?
A- The sample variance is represented by s2.
B- The sample variance is represented by b2.
C- The sample variance is represented by c2.
D- The sample variance is represented by x2.
145 1 0 ch2d 4 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc6 The sample variance is represented by
The sample variance is represented by s2.
A- true
B- false
C- no valid answer
146 1 0 ch2d 5 C
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc6 The sample variance is represented by
How is a sample variance represented?
A- c2
B- d2
C- s2
D- g2
147 0 0 ch2d 5 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc7 variance is represented by the Greek letter
How is the variance of an entire population represented?
A- variance is represented by the Greek letter σ2.
B- variance is represented by the Greek letter €2.
C- variance is represented by the Greek letter $2.
D- variance is represented by the Greek letter &2.
148 1 0 ch2d 4 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc7 variance is represented by the Greek letter
Population variance is represented by the Greek letter σ2 .
A- true
B- false
C- no valid answer
149 0 0 ch2d 5 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc7 variance is represented by the Greek letter
How is the variance of an entire population represented?
A- σ2
B- *2
C- @2
D- %
150 0 0 ch2d 5 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc7 variance is represented by the Greek letter
What does σ2 represent?
A- variance is represented by the Greek letter σ2.
B- mode is represented by the Greek letter σ2.
C- median is represented by the Greek letter σ2.
D- mean is represented by the Greek letter σ2.
151 1 0 ch2d 4 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc7 variance is represented by the Greek letter
Population variance is represented by the Greek letter σ2 .
A- true
B- false
C- no valid answer
152 0 0 ch2d 5 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc7 variance is represented by the Greek letter
What does σ2 represent?
A- Population variance
B- Sample variance
C- Second variance
D- Green variance
153 0 0 ch2d 5 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc7 variance is represented by the Greek letter
What is the difference between s2 and σ2?
A- population variance is represented by the Greek letter σ2 and s2 is the sample variance.
B- population variance is represented by the Greek letter s2 and &2 is the sample variance.
C- population variance is represented by the Greek letter σ2 and $2 is the sample variance.
D- population variance is represented by the Greek letter s2 and σ2 is the sample variance.
154 1 0 ch2d 4 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc7 variance is represented by the Greek letter
Sample variance is represented by the letter s2 .
A- true
B- false
C- no valid answer
155 0 0 ch2d 5 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc7 variance is represented by the Greek letter
What is the difference between s2 and σ2?
A- σ2 is the population variance and the s2 is the sample variance.
B- v2 is the population variance and the s2 is the sample variance.
C- σ2 is the population variance and the c2 is the sample variance.
D- s2 is the population variance and the σ2 is the sample variance.
156 0 0 ch2d 5 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc9 It measures how the data is spread out from its mean.
What does the standard deviation measure?
A- It measures how the data is spread out from its mean.
B- It measures how the data is spread out from its margins.
C- It measures how the data is spread out from its mode.
D- It measures how the data is spread out from its median.
157 1 0 ch2d 4 A
John Petroff=staff #1 2005-08-19; Andrei Manole=faculty#6091 2011
ch/ch2danc9 It measures how the data is spread out from its mean.
Standard deviation measures how the data is spread out from its mean.
A- true
B- false
C- no valid answer
158 2 0 ch2d 1 It measures how the data is spread out from its mean.
John Petroff=staff #1 2005-08-19;
ch/ch2danc9 It measures how the data is spread out from its mean.
What does the standard deviation measure?
159 0 0 ch2d 1 A
John Petroff=staff #1 2005-08-19;
ch/ch2danc10 The standard deviation is the square root of the variance, and
How is the st