Question 1

It is possible for a variable to have

Accepted Answer

A) one mode. 
B) many modes. 
C) no mode. 
D) all of these 
A) one mode. 
B) many modes. 
C) no mode. 
D) all of these

Question 2

The median represents the score that is

Accepted Answer

A) half of the sum of the other scores. 
B) the most common or frequent. 
C) in the middle. 
D) midway between the highest and lowest scores. 
A) half of the sum of the other scores. 
B) the most common or frequent. 
C) in the middle. 
D) midway between the highest and lowest scores.

Question 3

An instructor is preparing a report showing mid-semester grades and notes that the mean,median,and mode are all exactly 76.00.What can she conclude?

Accepted Answer

A) The distribution of grades is unskewed. 
B) There is a negative skew in the distribution (a few students have very low grades). 
C) There is a positive skew in the distribution (a few students have very high grades). 
D) all of these 
A) The distribution of grades is unskewed. 
B) There is a negative skew in the distribution (a few students have very low grades). 
C) There is a positive skew in the distribution (a few students have very high grades). 
D) all of these

Question 4

For variables measured at the interval-ratio level,the preferred measure of central tendency would be the

Accepted Answer

A) mode. 
B) quartile. 
C) mean. 
D) proportion. 
A) mode. 
B) quartile. 
C) mean. 
D) proportion.

Question 5

The three commonly used measures of central tendency are

Accepted Answer

A) mode,median,and mean. 
B) percentage,midpoint,and mean. 
C) mode,midpoint,and ratio. 
D) median,rate,and mode. 
A) mode,median,and mean. 
B) percentage,midpoint,and mean. 
C) mode,midpoint,and ratio. 
D) median,rate,and mode.

Question 6

If the scores of an even number of cases are arranged from high to low,the median is

Accepted Answer

A) the middle score. 
B) the average of the two middle scores. 
C) the average of the highest and lowest scores. 
D) the same as the mode. 
A) the middle score. 
B) the average of the two middle scores. 
C) the average of the highest and lowest scores. 
D) the same as the mode.

Question 7

The symbol X10 identifies

Accepted Answer

A) the first score. 
B) the tenth score. 
C) the mode. 
D) any score which has a value one tenth of the mean. 
A) the first score. 
B) the tenth score. 
C) the mode. 
D) any score which has a value one tenth of the mean.

Question 8

Income distributions almost always have a positive skew (since there are only a few very wealthy people).Therefore,the preferred measure of central tendency for this variable would be the

Accepted Answer

A) mode. 
B) median. 
C) mean. 
D) none of these 
A) mode. 
B) median. 
C) mean. 
D) none of these

Question 9

What measure of central tendency would be most appropriate to summarize data about the color of movie stars' eyes?

Accepted Answer

A) median 
B) mode 
C) mean 
D) none of these 
A) median 
B) mode 
C) mean 
D) none of these

Question 10

The median is the score of the middle case when the number of cases is

Accepted Answer

A) odd. 
B) even. 
C) more than 20. 
D) less than 20. 
A) odd. 
B) even. 
C) more than 20. 
D) less than 20.

Question 11

The most appropriate measure of central tendency for the variable age (measured in years)would be the

Accepted Answer

A) mode. 
B) quartile. 
C) mean. 
D) ratio. 
A) mode. 
B) quartile. 
C) mean. 
D) ratio.

Question 12

The median defines "central tendency" in terms of the

Accepted Answer

A) most common score. 
B) central case. 
C) most likely or probable score. 
D) largest score. 
A) most common score. 
B) central case. 
C) most likely or probable score. 
D) largest score.

Question 13

When interval-ratio data are badly skewed,the appropriate measure of central tendency is the

Accepted Answer

A) mode. 
B) median. 
C) mean. 
D) percentage. 
A) mode. 
B) median. 
C) mean. 
D) percentage.

Question 14

A distribution of income for a sample of 45 people that included the presidents of the 5 largest corporations in the United States and 40 assembly line workers would be

Accepted Answer

A) unskewed. 
B) negatively skewed. 
C) positively skewed. 
D) symmetrical. 
A) unskewed. 
B) negatively skewed. 
C) positively skewed. 
D) symmetrical.

Question 15

In a positively skewed distribution the mean is

Accepted Answer

A) equal in value to the median. 
B) greater in value than the median. 
C) less in value than the median. 
D) either equal or greater in value than the median,depending on the value of the mode. 
A) equal in value to the median. 
B) greater in value than the median. 
C) less in value than the median. 
D) either equal or greater in value than the median,depending on the value of the mode.

Question 16

What is the median of the following set of eleven grades?
$\begin{array}{llll}
55 & 60 &62&67&70&72&74&76&77&85&90&95
\end{array}$

Accepted Answer

A) Since these are interval-ratio scores,the median cannot be found. 
B) 70 
C) 71 
D) 72 
A) Since these are interval-ratio scores,the median cannot be found. 
B) 70 
C) 71 
D) 72

Question 17

Which measure of central tendency is like "a fulcrum that exactly balances all of the scores"?

Accepted Answer

A) mode 
B) median 
C) mean 
D) none of these 
A) mode 
B) median 
C) mean 
D) none of these

Question 18

What is the mean of the following scores?
$\begin{array}{llll}
13 & 18&23&35&41
\end{array}$

Accepted Answer

A) 23 
B) 24 
C) 26 
D) 28 
A) 23 
B) 24 
C) 26 
D) 28

Question 19

A math professor is wondering if students today are better or worse than in the past.He has given the same final to this year's class that he gave ten years ago.Compute mean,median,and mode for both classes and write a paragraph summarizing the differences.
 $$\begin{array}{l}
\underline{\text { This Year }}\
\begin{array} { l l l l l } 
35 & 45 & 65 & 75 & 87 \
80 & 69 & 71 & 53 & 90 \
99 & 95 & 70 & 81 & 73 \
93 & 67 & 61 & 57 & 74 \
72 & 7 & 71 & 81 & 83 \
\underline{\text { Ten Year }} & & & & \
\underline{ \text { Ago } }& & & & \
76 & 7 & 75 & 76 & 59 \
74 & 51 & 89 & 55 & 79 \
67 & 77 & 69 & 91 & 68 \
90 & 65 & 79 & 69 & 79 \
97 & 86 & 98 & 91 & 95
\end{array}
\end{array}$$

Accepted Answer

None

Question 20

The sum of the differences between the scores of a distribution and the mean of the scores is always

Accepted Answer

A) 0 
B) 1 
C) the same as the number of cases 
D) none of these 
A) 0 
B) 1 
C) the same as the number of cases 
D) none of these

It is possible for a variable to have

The median represents the score that is

An instructor is preparing a report showing mid-semester grades and notes that the mean,median,and mode are all exactly 76.00.What can she conclude?

For variables measured at the interval-ratio level,the preferred measure of central tendency would be the

The three commonly used measures of central tendency are

If the scores of an even number of cases are arranged from high to low,the median is

The symbol X₁₀ identifies

Income distributions almost always have a positive skew (since there are only a few very wealthy people).Therefore,the preferred measure of central tendency for this variable would be the

What measure of central tendency would be most appropriate to summarize data about the color of movie stars' eyes?

The median is the score of the middle case when the number of cases is

The most appropriate measure of central tendency for the variable age (measured in years)would be the

The median defines "central tendency" in terms of the

When interval-ratio data are badly skewed,the appropriate measure of central tendency is the

A distribution of income for a sample of 45 people that included the presidents of the 5 largest corporations in the United States and 40 assembly line workers would be

In a positively skewed distribution the mean is

What is the median of the following set of eleven grades? 55 60 62 67 70 72 74 76 77 85 90 95

Which measure of central tendency is like "a fulcrum that exactly balances all of the scores"?

What is the mean of the following scores? 13 18 23 35 41

The sum of the differences between the scores of a distribution and the mean of the scores is always

Introduction

Basic Descriptive Statistics: Percentages Ratios and Rates Frequency Distributions

Charts and Graphs

Measures of Dispersion

The Normal Curve

Introduction in Inferential Statistics, the Sampling Distribution, and Estimation

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

Introduction to Bivariate Association and Measures of Association for Variables Measured at the Nominal Level

Association Between Variables Measured at the Ordinal Level

Association Between Variables Measured at the Interval-Ratio Level

Partial Correlation and Multiple Regression and Correlation

Filters

Exam 4: Measures of Central Tendency

It is possible for a variable to have

The median represents the score that is

An instructor is preparing a report showing mid-semester grades and notes that the mean,median,and mode are all exactly 76.00.What can she conclude?

For variables measured at the interval-ratio level,the preferred measure of central tendency would be the

The three commonly used measures of central tendency are

If the scores of an even number of cases are arranged from high to low,the median is

The symbol X10 identifies

Income distributions almost always have a positive skew (since there are only a few very wealthy people).Therefore,the preferred measure of central tendency for this variable would be the

What measure of central tendency would be most appropriate to summarize data about the color of movie stars' eyes?

The median is the score of the middle case when the number of cases is

The most appropriate measure of central tendency for the variable age (measured in years)would be the

The median defines "central tendency" in terms of the

When interval-ratio data are badly skewed,the appropriate measure of central tendency is the

A distribution of income for a sample of 45 people that included the presidents of the 5 largest corporations in the United States and 40 assembly line workers would be

In a positively skewed distribution the mean is

What is the median of the following set of eleven grades? 55 60 62 67 70 72 74 76 77 85 90 95

Which measure of central tendency is like "a fulcrum that exactly balances all of the scores"?

What is the mean of the following scores? 13 18 23 35 41

The sum of the differences between the scores of a distribution and the mean of the scores is always

Introduction

Basic Descriptive Statistics: Percentages Ratios and Rates Frequency Distributions

Charts and Graphs

Measures of Dispersion

The Normal Curve

Introduction in Inferential Statistics, the Sampling Distribution, and Estimation

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

Introduction to Bivariate Association and Measures of Association for Variables Measured at the Nominal Level

Association Between Variables Measured at the Ordinal Level

Association Between Variables Measured at the Interval-Ratio Level

Partial Correlation and Multiple Regression and Correlation

Filters

The symbol X₁₀ identifies