Question 1

For this set of data, the mean  is equal to ______. 9, 8, 10, 5, 5, 2, 3, 9, 6, 3

Accepted Answer

A)   5.67
B)   51
C)   353
D)   2601E) A) and B)
F) A) and C)

Question 2

What is the population standard deviation (σ)  for this set of data? 72, 61, 80, 76, 54

Accepted Answer

A)   10.81
B)   68.60
C)   93.44
D)   9.67E) B) and C)
F) A) and B)

Question 3

Which of the following is a strength of the range?

Accepted Answer

A)   It accurately reflects the amount of variability in the entire distribution of scores.
B)   It provides information about the sample from which the data were collected.
C)   It represents the variability in a set of data while lessening the influence of outliers.
D)   It can be used in statistical analyses designed to test hypotheses about distributions.E) C) and D)
F) None of the above

Question 4

What would the standard deviation be for the following data? 25, 27, 29, 20, 21

Accepted Answer

A)   3.15
B)   3.85
C)   15
D)   16.80E) B) and C)
F) A) and D)

Question 5

What is the sum of squared scores  for this set of data? 6, 2, 10, 7

Accepted Answer

A)   25.00
B)   189.00
C)   625.00
D)   6.25E) B) and D)
F) C) and D)

Question 6

Which of these is based on all of the scores in a set of data?

Accepted Answer

A)   mode
B)   median
C)   variance
D)   rangeE) All of the above
F) B) and C)

Question 7

Which of these distributions will have the smallest standard deviation?

Accepted Answer

A)   flat
B)   peaked
C)   skewed
D)   bimodalE) B) and C)
F) A) and D)

Question 8

What is the standard deviation (s)  for this set of data? 11, 16, 21

Accepted Answer

A)   4.08
B)   5.00
C)   16.00
D)   25.00E) A) and B)
F) B) and C)

Question 9

Calculating the variance (s2)  involves ______ deviations because______.

Accepted Answer

A)   squaring; the sum of unsquared deviations is equal to 0
B)   multiplying; samples are smaller than populations
C)   subtracting; deviations are always positive
D)   dividing; distributions are sometimes skewed (asymmetric) E) None of the above
F) A) and B)

Question 10

The ______ primarily measures the ______ of a distribution of scores for a variable.

Accepted Answer

A)   range; variability
B)   standard deviation; symmetry
C)   mean; variability
D)   variance; modalityE) None of the above
F) A) and C)

Question 11

The ______ is the range of the middle 50% of the scores in a set of data.

Accepted Answer

A)   variance
B)   standard deviation
C)   range
D)   interquartile rangeE) A) and B)
F) All of the above

Question 12

______ is a ______, which is used to describe a ______.

Accepted Answer

A)    ; parameter; sample
B)   s; statistic; population
C)   μ; parameter; population
D)   σ; statistic; sampleE) C) and D)
F) A) and C)

Question 13

______ is an example of a ______.

Accepted Answer

A)   σ; measure of variability
B)   s; measure of central tendency
C)   s; parameter
D)   μ; statisticE) B) and C)
F) None of the above

Question 14

Compared with other measures of variability, what is a strength of the range?

Accepted Answer

A)   It is quick and easy to compute.
B)   It can be used in statistics designed to test hypotheses.
C)   It is based on all of the scores in the set of data.
D)   It is not affected by outliers.E) None of the above
F) A) and D)

Question 15

George calculates a standard deviation and obtains a value of s = -5.37. This necessarily implies ______.

Accepted Answer

A)   the distribution of scores is negatively skewed
B)   there is a small amount of variability in the set of data
C)   the distribution is bimodal
D)   he needs to check his calculationsE) None of the above
F) B) and D)

Question 16

The interquartile range can be defined as ______.

Accepted Answer

A)   the highest score minus the lowest score in a set of data
B)   the range of the middle 50% of the scores in a set of data
C)   the range of all of the scores in a set of data
D)   the average deviation of a score from the meanE) A) and D)
F) B) and D)

Question 17

What is the standard deviation (s)  for this set of data? 2, 6, 10

Accepted Answer

A)   4.00
B)   6.00
C)   16.00
D)   3.27E) All of the above
F) B) and D)

Question 18

One weakness of the range is that it cannot be used in statistical analyses designed to test hypotheses about populations.

Accepted Answer

A) True 
 B)False

Question 19

What is the population standard deviation (σ)  for this set of data? 11.64, 12.70, 15.33, 9.85, 10.47

Accepted Answer

A)   2.16
B)   12.00
C)   3.73
D)   1.93E) A) and C)
F) B) and C)

Question 20

______ is a ______, which is used to describe a ______.

Accepted Answer

A)   σ; parameter; sample
B)   μ; statistic; population
C)   s; parameter; population
D)    ; statistic; sampleE) B) and C)
F) B) and D)

Exam 4: Measures of Variability

Which of these is based on all of the scores in a set of data?

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The ______ primarily measures the ______ of a distribution of scores for a variable.

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Calculating the variance (s2) involves ______ deviations because______.

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Compared with other measures of variability, what is a strength of the range?

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What is the standard deviation (s) for this set of data? 2, 6, 10

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Which of the following is a strength of the range?

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The interquartile range can be defined as ______.

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What is the standard deviation (s) for this set of data? 11, 16, 21

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______ is a ______, which is used to describe a ______.

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Which of these distributions will have the smallest standard deviation?

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The ______ is the range of the middle 50% of the scores in a set of data.

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What is the population standard deviation (σ) for this set of data? 72, 61, 80, 76, 54

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______ is a ______, which is used to describe a ______.

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One weakness of the range is that it cannot be used in statistical analyses designed to test hypotheses about populations.

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______ is an example of a ______.

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What would the standard deviation be for the following data? 25, 27, 29, 20, 21

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For this set of data, the mean is equal to ______. 9, 8, 10, 5, 5, 2, 3, 9, 6, 3

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What is the population standard deviation (σ) for this set of data? 11.64, 12.70, 15.33, 9.85, 10.47

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George calculates a standard deviation and obtains a value of s = -5.37. This necessarily implies ______.

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What is the sum of squared scores for this set of data? 6, 2, 10, 7

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The primarily measures the of a distribution of scores for a variable.

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Calculating the variance (s²) involves deviations because.

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is a , which is used to describe a __.

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is a , which is used to describe a __.

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is an example of a .

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