Question 1

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. D

Question 2

When computing the standard deviation from grouped data,the sum of the deviations is approximated by using the ____ of the intervals.

Accepted Answer

A) midpoints 
B) lower real limits 
C) upper real limits 
D) all of the above 
A) midpoints 
B) lower real limits 
C) upper real limits 
D) all of the above A

Question 3

The average deviation (AD)is based on

Accepted Answer

A) squaring the differences between the score and the mean. 
B) ignoring the signs of the differences between the scores and the mean. 
C) subtracting each score from the median. 
D) subtracting each score from the mode. 
A) squaring the differences between the score and the mean. 
B) ignoring the signs of the differences between the scores and the mean. 
C) subtracting each score from the median. 
D) subtracting each score from the mode. B

Question 4

Since the 1960s,the income associated with the 80th percentile has ____ and the income associated with the 20th percentile has ____.

Accepted Answer

A) risen,risen 
B) stayed roughly the same,risen 
C) fallen,risen 
D) risen,stayed roughly the same 
A) risen,risen 
B) stayed roughly the same,risen 
C) fallen,risen 
D) risen,stayed roughly the same

Question 5

If male and female college students work an average of 15 hours per week during the school year and the standard deviation is 5.4 for male students and 2.3 for female students,what may we conclude?

Accepted Answer

A) males are more heterogeneous on this variable 
B) females are more heterogeneous on this variable 
C) the median number of hours worked is the same 
D) the modal number of hours worked is the same 
A) males are more heterogeneous on this variable 
B) females are more heterogeneous on this variable 
C) the median number of hours worked is the same 
D) the modal number of hours worked is the same

Question 6

Some information about auto theft rates (number of auto thefts per 100,000 population)for a sample of 178 cities in two different years is summarized below.Express this statistical information in words.What changes were there in the overall shape of the distribution of this variable? In central tendency? In dispersion?
 $\begin{array}{|l|l|l|}
\hline & 1985 & 2005 \
\hline \text { Mean }= & 150.32 & 125.17 \
\hline \text { Median }= & 117.17 & 123.01 \
\hline \text { Standard } & & \
\hline \text { Deviation }= & 12.23 & 7.01 \
\hline & &
\end{array}$

Accepted Answer

The distribution of auto theft rates in

Question 7

When computing the standard deviation from grouped data,we must assume that the scores are clustered at the ____ of the interval.

Accepted Answer

A) mode 
B) lower real limit 
C) upper real limit 
D) midpoint 
A) mode 
B) lower real limit 
C) upper real limit 
D) midpoint

Question 8

The income of a sample has been measured in dollars per year.Which of the following would be the preferred measure the dispersion for this variable? The

Accepted Answer

A) index of qualitative variation. 
B) average deviation. 
C) quartile deviation. 
D) standard deviation. 
A) index of qualitative variation. 
B) average deviation. 
C) quartile deviation. 
D) standard deviation.

Question 9

The expression S(Xi - $\bar { X }$
)instructs us to

Accepted Answer

A) sum the scores. 
B) sum the scores and then subtract the mean. 
C) subtract every "ith" score from the mean. 
D) subtract the mean from each score and add up the deviations. 
A) sum the scores. 
B) sum the scores and then subtract the mean. 
C) subtract every "ith" score from the mean. 
D) subtract the mean from each score and add up the deviations.

Question 10

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 11

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.

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

Since computation of the standard deviation requires addition,division,and other mathematical operations,it should be used for

Accepted Answer

A) interval-ratio level variables. 
B) non-continuous variables at any level of measurement. 
C) nominal level variables. 
D) discrete variables only. 
A) interval-ratio level variables. 
B) non-continuous variables at any level of measurement. 
C) nominal level variables. 
D) discrete variables only.

Question 14

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 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 easy to calculate and interpret. 
D) all of the above

Question 15

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.

Question 16

Between 1980 and 2005,the IQV for religious denomination in a society increased from 0.55 to 0.78.This means that the society is becoming

Accepted Answer

A) more religious. 
B) more diverse in religious denomination. 
C) less diverse in religious denomination. 
D) more secular. 
A) more religious. 
B) more diverse in religious denomination. 
C) less diverse in religious denomination. 
D) more secular.

Question 17

The standard deviation (s)differs from the average deviation (AD)in that it

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 18

If the variance of a distribution is 16,the mean is 12,and the number of cases is 24,the standard deviation is

Accepted Answer

A) 4 
B) 6 
C) 8 
D) 12 
A) 4 
B) 6 
C) 8 
D) 12

Question 19

The index of qualitative variation (IQV)is the ratio of the actual variation in the scores to

Accepted Answer

A) One. 
B) the maximum variation possible. 
C) the minimum variation possible. 
D) the number of scores. 
A) One. 
B) the maximum variation possible. 
C) the minimum variation possible. 
D) the number of scores.

Question 20

The range (R)is found by subtracting the lowest from the highest score in the distribution.Therefore,R could NOT be found for

Accepted Answer

A) nominal level variables. 
B) discrete variables. 
C) ordinal level variables. 
D) continuous variables. 
A) nominal level variables. 
B) discrete variables. 
C) ordinal level variables. 
D) continuous variables.

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

When computing the standard deviation from grouped data,the sum of the deviations is approximated by using the ____ of the intervals.

The average deviation (AD)is based on

Since the 1960s,the income associated with the 80^th percentile has and the income associated with the 20^th percentile has .

If male and female college students work an average of 15 hours per week during the school year and the standard deviation is 5.4 for male students and 2.3 for female students,what may we conclude?

When computing the standard deviation from grouped data,we must assume that the scores are clustered at the ____ of the interval.

The income of a sample has been measured in dollars per year.Which of the following would be the preferred measure the dispersion for this variable? The

The expression S(X_i - $\bar { X }$ )instructs us to

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 second quartile (Q₂)is equal in value to

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

Since computation of the standard deviation requires addition,division,and other mathematical operations,it should be used for

A "good" measure of dispersion should

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

Between 1980 and 2005,the IQV for religious denomination in a society increased from 0.55 to 0.78.This means that the society is becoming

The standard deviation (s)differs from the average deviation (AD)in that it

If the variance of a distribution is 16,the mean is 12,and the number of cases is 24,the standard deviation is

The index of qualitative variation (IQV)is the ratio of the actual variation in the scores to

The range (R)is found by subtracting the lowest from the highest score in the distribution.Therefore,R could NOT be found for

Introduction

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

Measures of Central Tendency

The Normal Curve

Introduction to Inferential Statistics: Sampling and the Sampling Distribution

Estimation Procedures

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: Introduction and Basic Concepts

Association Between Variables Measured at the Nominal Level

Association Between Variables Measured at the Ordinal Level

Association Between Variables Measured at the Interval-Ratio Level

Elaborating Bivariate Tables

Partial Correlation and Multiple Regression and Correlation

Filters

Exam 4: Measures of Dispersion

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

When computing the standard deviation from grouped data,the sum of the deviations is approximated by using the ____ of the intervals.

The average deviation (AD)is based on

Since the 1960s,the income associated with the 80th percentile has ____ and the income associated with the 20th percentile has ____.

If male and female college students work an average of 15 hours per week during the school year and the standard deviation is 5.4 for male students and 2.3 for female students,what may we conclude?

When computing the standard deviation from grouped data,we must assume that the scores are clustered at the ____ of the interval.

The income of a sample has been measured in dollars per year.Which of the following would be the preferred measure the dispersion for this variable? The

The expression S(Xi - Xˉ\bar { X }Xˉ )instructs us to

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 second quartile (Q2)is equal in value to

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

Since computation of the standard deviation requires addition,division,and other mathematical operations,it should be used for

A "good" measure of dispersion should

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

Between 1980 and 2005,the IQV for religious denomination in a society increased from 0.55 to 0.78.This means that the society is becoming

The standard deviation (s)differs from the average deviation (AD)in that it

If the variance of a distribution is 16,the mean is 12,and the number of cases is 24,the standard deviation is

The index of qualitative variation (IQV)is the ratio of the actual variation in the scores to

The range (R)is found by subtracting the lowest from the highest score in the distribution.Therefore,R could NOT be found for

Introduction

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

Measures of Central Tendency

The Normal Curve

Introduction to Inferential Statistics: Sampling and the Sampling Distribution

Estimation Procedures

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: Introduction and Basic Concepts

Association Between Variables Measured at the Nominal Level

Association Between Variables Measured at the Ordinal Level

Association Between Variables Measured at the Interval-Ratio Level

Elaborating Bivariate Tables

Partial Correlation and Multiple Regression and Correlation

Filters

Since the 1960s,the income associated with the 80^th percentile has and the income associated with the 20^th percentile has .

The expression S(X_i - $\bar { X }$ )instructs us to

The second quartile (Q₂)is equal in value to