Question 1

As a distribution of scores becomes more variable, the value of the standard deviation

Accepted Answer

A)  decreases 
B)  stays the same 
C)  increases 
D)  becomes unpredictable 
A)  decreases 
B)  stays the same 
C)  increases 
D)  becomes unpredictable C

Question 2

The second quartile (Q2) is equal in value to

Accepted Answer

A)  the mode 
B)  the median 
C)  the mean 
D)  the range 
A)  the mode 
B)  the median 
C)  the mean 
D)  the range B

Question 3

If distribution A and distribution B have the same mean but A has a larger standard deviation, we may conclude that

Accepted Answer

A)  the medians of both distributions would be the same 
B)  distribution B has a range of 0 
C)  A has a greater degree of dispersion 
D)  distribution B displays more variety 
A)  the medians of both distributions would be the same 
B)  distribution B has a range of 0 
C)  A has a greater degree of dispersion 
D)  distribution B displays more variety C

Question 4

The text presented information about life expectancy in 40 nations. According to this information, nations at the highest income level had _______ average life expectancy and were ____ diverse.

Accepted Answer

A)  higher … more 
B)  higher … less 
C)  lower … more 
D)  lower … less 
A)  higher … more 
B)  higher … less 
C)  lower … more 
D)  lower … less

Question 5

According to the data presented in the text, the share of income going to the lowest 20% of Americans from 1967 to 2012

Accepted Answer

A)  remained virtually unchanged 
B)  rose dramatically 
C)  declined 
D)  rose until 1998 and then fell 
A)  remained virtually unchanged 
B)  rose dramatically 
C)  declined 
D)  rose until 1998 and then fell

Question 6

If male and female college students have the same mean GPA but the standard deviation for females is much larger, you may conclude that

Accepted Answer

A)  males are smarter than females 
B)  modal GPAs for both groups would be the same 
C)  median GPAs for both groups would be the same 
D)  there is more variability among female students with respect to GPA 
A)  males are smarter than females 
B)  modal GPAs for both groups would be the same 
C)  median GPAs for both groups would be the same 
D)  there is more variability among female students with respect to GPA

Question 7

If a distribution of scores has a mean of 30 and a range of 0:

Accepted Answer

A)  the variance is 30 
B)  the interquartile range (Q) is 10 
C)  there is no dispersion in the distribution 
D)  the standard deviation is 1 
A)  the variance is 30 
B)  the interquartile range (Q) is 10 
C)  there is no dispersion in the distribution 
D)  the standard deviation is 1

Question 8

The interquartile range would be an appropriate measure of dispersion for

Accepted Answer

A)  nominal level variables 
B)  interval-ratio level variables only 
C)  ordinal level variables 
D)  skewed variables only 
A)  nominal level variables 
B)  interval-ratio level variables only 
C)  ordinal level variables 
D)  skewed variables only

Question 9

If you calculated the standard deviation for a distribution of 20 scores, removed the 5 highest scores and recalculated, the value of the standard deviation would

Accepted Answer

A)  increase 
B)  stay the same 
C)  decrease 
D)  be reduced by five 
A)  increase 
B)  stay the same 
C)  decrease 
D)  be reduced by five

Question 10

The sum of the squared deviations around the mean for a distribution of 10 scores is 1000. The standard deviation

Accepted Answer

A)  is 10 
B)  is 100 
C)  is 1 
D)  can't be determined from this information 
A)  is 10 
B)  is 100 
C)  is 1 
D)  can't be determined from this information

Question 11

If a variable is interval-ratio in level of measurement, the preferred measure of dispersion would be

Accepted Answer

A)  the mean 
B)  the range 
C)  the standard deviation 
D)  the percentile 
A)  the mean 
B)  the range 
C)  the standard deviation 
D)  the percentile

Question 12

Measures of dispersion indicate the degree to which a set of scores is

Accepted Answer

A)  heterogeneous 
B)  ambiguous 
C)  average 
D)  typical 
A)  heterogeneous 
B)  ambiguous 
C)  average 
D)  typical

Question 13

If the standard deviation of a group of scores is 0,

Accepted Answer

A)  the range would be at a maximum value 
B)  there is maximum variation in the scores 
C)  there is no variation in the scores 
D)  the mean is larger than the median 
A)  the range would be at a maximum value 
B)  there is maximum variation in the scores 
C)  there is no variation in the scores 
D)  the mean is larger than the median

Question 14

Boxplots are graphs that display the

Accepted Answer

A)  median 
B)  range 
C)  interquartile range 
D)  all of the above 
A)  median 
B)  range 
C)  interquartile range 
D)  all of the above

Question 15

Measures of dispersion provide information about the

Accepted Answer

A)  typical or most common score 
B)  variety within the distribution of scores 
C)  size of the sample 
D)  adequacy of the selection criteria for the sample 
A)  typical or most common score 
B)  variety within the distribution of scores 
C)  size of the sample 
D)  adequacy of the selection criteria for the sample

Question 16

The standard deviation (s)

Accepted Answer

A)  squares the deviations to eliminate minus values 
B)  decreases in value as distributions become more heterogeneous 
C)  does not use all the scores 
D)  is based on the median rather than the mean 
A)  squares the deviations to eliminate minus values 
B)  decreases in value as distributions become more heterogeneous 
C)  does not use all the scores 
D)  is based on the median rather than the mean

Question 17

Which of the following data sets shows the greatest variability?

Accepted Answer

A)  9, 10, 11 
B)  0, 5, 6 
C)  50, 60, 170 
D)  31, 33, 35 
A)  9, 10, 11 
B)  0, 5, 6 
C)  50, 60, 170 
D)  31, 33, 35

Question 18

When you subtract the value of the mean from each score in a distribution and then add the results, the sum will be

Accepted Answer

A)  0 
B)  the standard deviation 
C)  the variance 
D)  a positive number 
A)  0 
B)  the standard deviation 
C)  the variance 
D)  a positive number

Question 19

A "good" measure of dispersion should

Accepted Answer

A)  use all scores in a distribution 
B)  describe the average or typical deviation of the scores 
C)  be relatively easy to calculate and interpret 
D)  all of the above 
A)  use all scores in a distribution 
B)  describe the average or typical deviation of the scores 
C)  be relatively easy to calculate and interpret 
D)  all of the above

Question 20

Four students have applied to a special program and only one can be accepted. They have taken a battery of 12 tests and all have exactly the same average score. The standard deviation of their test scores are: Student A = 3.12, Student B = 0.27, Student C = 13.45, Student D = 6.45. If consistency of performance is a criteria for acceptance, which of the four students should be selected?

Accepted Answer

A)  A 
B)  B 
C)  C 
D)  D 
A)  A 
B)  B 
C)  C 
D)  D

As a distribution of scores becomes more variable, the value of the standard deviation

The second quartile (Q2) is equal in value to

If distribution A and distribution B have the same mean but A has a larger standard deviation, we may conclude that

The text presented information about life expectancy in 40 nations. According to this information, nations at the highest income level had ___ average life expectancy and were diverse.

According to the data presented in the text, the share of income going to the lowest 20% of Americans from 1967 to 2012

If male and female college students have the same mean GPA but the standard deviation for females is much larger, you may conclude that

If a distribution of scores has a mean of 30 and a range of 0:

The interquartile range would be an appropriate measure of dispersion for

If you calculated the standard deviation for a distribution of 20 scores, removed the 5 highest scores and recalculated, the value of the standard deviation would

The sum of the squared deviations around the mean for a distribution of 10 scores is 1000. The standard deviation

If a variable is interval-ratio in level of measurement, the preferred measure of dispersion would be

Measures of dispersion indicate the degree to which a set of scores is

If the standard deviation of a group of scores is 0,

Boxplots are graphs that display the

Measures of dispersion provide information about the

The standard deviation (s)

Which of the following data sets shows the greatest variability?

When you subtract the value of the mean from each score in a distribution and then add the results, the sum will be

A "good" measure of dispersion should

Introduction

Basic Descriptive Statistics Percentages, Ratios Rates, Tables, Charts Graphs

Measures of Central Tendency

The Normal Curve

Introduction to Inferential Statistics Sampling the Sampling Distribution

Hypothesis Testing I the One-Sample Case

Hypothesis Testing II the Two-Sample Case

Hypothesis Testing III: the Analysis of Variance

Hypothesis Testing Iv Chi Square

Bivariate Association for Nominal- and Ordinal-Level Variables

Association Between Variables Measured at the Interval-Ratio Level

Partial Correlation and

Filters

Exam 4: Measures of Dispersion

As a distribution of scores becomes more variable, the value of the standard deviation

The second quartile (Q2) is equal in value to

If distribution A and distribution B have the same mean but A has a larger standard deviation, we may conclude that

The text presented information about life expectancy in 40 nations. According to this information, nations at the highest income level had _______ average life expectancy and were ____ diverse.

According to the data presented in the text, the share of income going to the lowest 20% of Americans from 1967 to 2012

If male and female college students have the same mean GPA but the standard deviation for females is much larger, you may conclude that

If a distribution of scores has a mean of 30 and a range of 0:

The interquartile range would be an appropriate measure of dispersion for

If you calculated the standard deviation for a distribution of 20 scores, removed the 5 highest scores and recalculated, the value of the standard deviation would

The sum of the squared deviations around the mean for a distribution of 10 scores is 1000. The standard deviation

If a variable is interval-ratio in level of measurement, the preferred measure of dispersion would be

Measures of dispersion indicate the degree to which a set of scores is

If the standard deviation of a group of scores is 0,

Boxplots are graphs that display the

Measures of dispersion provide information about the

The standard deviation (s)

Which of the following data sets shows the greatest variability?

When you subtract the value of the mean from each score in a distribution and then add the results, the sum will be

A "good" measure of dispersion should

Introduction

Basic Descriptive Statistics Percentages, Ratios Rates, Tables, Charts Graphs

Measures of Central Tendency

The Normal Curve

Introduction to Inferential Statistics Sampling the Sampling Distribution

Hypothesis Testing I the One-Sample Case

Hypothesis Testing II the Two-Sample Case

Hypothesis Testing III: the Analysis of Variance

Hypothesis Testing Iv Chi Square

Bivariate Association for Nominal- and Ordinal-Level Variables

Association Between Variables Measured at the Interval-Ratio Level

Partial Correlation and

Filters

The text presented information about life expectancy in 40 nations. According to this information, nations at the highest income level had ___ average life expectancy and were diverse.