Question 1

Roughly speaking, the standard deviation is the average amount that scores differ from the:

Accepted Answer

A) histogram 
B) median 
C) mean 
D) range 
A) histogram 
B) median 
C) mean 
D) range C

Question 2

A group of scores is 2, 2, 4, 8, 9, 2, 10, 15, 30, 30. What is the mode?

Accepted Answer

2

Question 3

The standard deviation of a group of scores is 4. What is the variance?

Accepted Answer

A) 2 
B) 4 
C) 8 
D) 16 
A) 2 
B) 4 
C) 8 
D) 16 D

Question 4

In a distribution of Z scores, the mean is always:

Accepted Answer

A) 10 
B) 1 
C) 0 
D) 50 
A) 10 
B) 1 
C) 0 
D) 50

Question 5

The variance of a group of scores is the average of the __________.

Accepted Answer

squared deviations f

Question 6

A group of scores is 2, 2, 4, 8, 9, 25. What is the median?

Accepted Answer

The answer of A group of scores is 2, 2,...

Question 7

A group of scores is 6, 7, 7, 8, 10, 11. What is N?

Accepted Answer

The answer of A group of scores is 6, 7,...

Question 8

A __________ describes a particular score in terms of where it fits into the overall group of scores.

Accepted Answer

A) standard deviation 
B) computational formula 
C) Z score 
D) Q score 
A) standard deviation 
B) computational formula 
C) Z score 
D) Q score

Question 9

In a distribution with an even number of scores, the median will be the:

Accepted Answer

A) most common value 
B) average of the two middle scores 
C) the median divided by the mean 
D) the sum of score divided by N - 1 
A) most common value 
B) average of the two middle scores 
C) the median divided by the mean 
D) the sum of score divided by N - 1

Question 10

Which statement is true for the scores 1, 2, 3, 4, 5, 5, 7, 8, 9, 10, 12, 12, 13?

Accepted Answer

A) The mode is greater than the median 
B) The median is greater than the mean 
C) The median is greater than the mode 
D) The mode is greater than the mean 
A) The mode is greater than the median 
B) The median is greater than the mean 
C) The median is greater than the mode 
D) The mode is greater than the mean

Question 11

What is the variance of these three scores: 1, 4, 7?

Accepted Answer

A) 3 
B) 4 
C) 6 
D) 9 
A) 3 
B) 4 
C) 6 
D) 9

Question 12

In a class of students in which everyone is exactly 24 years old, the variance would be:

Accepted Answer

A) approximately 1 
B) exactly 0 
C) between 0 and 1 
D) impossible to determine without more information 
A) approximately 1 
B) exactly 0 
C) between 0 and 1 
D) impossible to determine without more information

Question 13

In statistics, the best measure of the representative value of a group of scores is usually the mode. (True or False)

Accepted Answer

A) True 
 B)False

Question 14

The mode can be a poor representative value because:

Accepted Answer

A) it can be difficult to calculate without a statistical software package 
B) it does not reflect many aspects of the distribution 
C) it is generally larger than the mean 
D) all of the above 
A) it can be difficult to calculate without a statistical software package 
B) it does not reflect many aspects of the distribution 
C) it is generally larger than the mean 
D) all of the above

Question 15

A researcher surveys job satisfaction among laborers and white-collar workers. (Job satisfaction is rated on a scale from 1 = low satisfaction to 10 = high satisfaction.)Results show that laborers have a mean job satisfaction score of 3 and a variance of 1; white-collar workers have a mean job satisfaction rating of 7 and a variance of 10. Which statement best describes what these numbers mean?

Accepted Answer

A) White-collar workers are less satisfied than laborers. 
B) White-collar workers and laborers are about equally satisfied. 
C) Laborers generally are less satisfied than white-collar workers, but laborers are just as likely to be highly satisfied as white-collar workers are to be highly dissatisfied. 
D) Laborers are less satisfied than white-collar workers and most laborers are about equally dissatisfied while there is more variation in the satisfaction of white-collar workers. 
A) White-collar workers are less satisfied than laborers. 
B) White-collar workers and laborers are about equally satisfied. 
C) Laborers generally are less satisfied than white-collar workers, but laborers are just as likely to be highly satisfied as white-collar workers are to be highly dissatisfied. 
D) Laborers are less satisfied than white-collar workers and most laborers are about equally dissatisfied while there is more variation in the satisfaction of white-collar workers.

Question 16

A museum curator was interested in people's responses to art. She therefore had seven people indicate their liking for a particular piece of Egyptian sculpture. Their ratings were as follows: 2, 4, 4, 5, 6, 7, 7.
Figure the mean, median, mode, variance, and standard deviation for this group of scores.
Explain what you have done and what the results mean to a person who has never had a course in statistics.

Accepted Answer

Mean = 35/7 = 5
Median = 5
Mod

Question 17

In order to compute the range of a group of scores, one must:

Accepted Answer

A) subtract the lowest score from the highest score 
B) multiply the lowest score by the average 
C) multiply the highest score by the average 
D) subtract the lowest score from the highest and divide by N 
A) subtract the lowest score from the highest score 
B) multiply the lowest score by the average 
C) multiply the highest score by the average 
D) subtract the lowest score from the highest and divide by N

Question 18

Unless there are __________ , behavioral and social scientists generally use the mean as the measure of the representative value of a group of scores.

Accepted Answer

A) outliers 
B) histograms 
C) Z scores 
D) two modes 
A) outliers 
B) histograms 
C) Z scores 
D) two modes

Question 19

In statistical formulas, what does N stand for?

Accepted Answer

A) The number of different values possible on the variable 
B) The number of scores in a distribution 
C) The normal curve 
D) The normalized Z score in a distribution of scores 
A) The number of different values possible on the variable 
B) The number of scores in a distribution 
C) The normal curve 
D) The normalized Z score in a distribution of scores

Question 20

A person's raw score is 7, the mean is 13, and the standard deviation is 3. What is the person's Z score?

Accepted Answer

A) -2 
B) -1 
C) 1 
D) 2 
A) -2 
B) -1 
C) 1 
D) 2

Roughly speaking, the standard deviation is the average amount that scores differ from the:

A group of scores is 2, 2, 4, 8, 9, 2, 10, 15, 30, 30. What is the mode?

The standard deviation of a group of scores is 4. What is the variance?

In a distribution of Z scores, the mean is always:

The variance of a group of scores is the average of the __________.

A group of scores is 2, 2, 4, 8, 9, 25. What is the median?

A group of scores is 6, 7, 7, 8, 10, 11. What is N?

A __________ describes a particular score in terms of where it fits into the overall group of scores.

In a distribution with an even number of scores, the median will be the:

Which statement is true for the scores 1, 2, 3, 4, 5, 5, 7, 8, 9, 10, 12, 12, 13?

What is the variance of these three scores: 1, 4, 7?

In a class of students in which everyone is exactly 24 years old, the variance would be:

In statistics, the best measure of the representative value of a group of scores is usually the mode. (True or False)

The mode can be a poor representative value because:

In order to compute the range of a group of scores, one must:

Unless there are __________ , behavioral and social scientists generally use the mean as the measure of the representative value of a group of scores.

In statistical formulas, what does N stand for?

A person's raw score is 7, the mean is 13, and the standard deviation is 3. What is the person's Z score?

Displaying the Order in a Group of Numbers Using Tables and Graphs

Correlation and Prediction

Some Key Ingredients for Inferential Statistics: the Normal Curve, Sample Versus Population, and Probability

Introduction to Hypothesis Testing

Hypothesis Tests With Means of Samples

Making Sense of Statistical Significance: Effect Size and Statistical Power

Introduction to the T Test: Single Sample and Dependent Means

The T Test for Independent Means

Introduction to the Analysis of Variance

Chi-Square Tests and Strategies When Population Distributions Are Not Normal

Applying Statistical Methods in Your Own Research Project

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Exam 2: The Mean, Variance, Standard Deviation, and Z Scores

Roughly speaking, the standard deviation is the average amount that scores differ from the:

A group of scores is 2, 2, 4, 8, 9, 2, 10, 15, 30, 30. What is the mode?

The standard deviation of a group of scores is 4. What is the variance?

In a distribution of Z scores, the mean is always:

The variance of a group of scores is the average of the __________.

A group of scores is 2, 2, 4, 8, 9, 25. What is the median?

A group of scores is 6, 7, 7, 8, 10, 11. What is N?

A __________ describes a particular score in terms of where it fits into the overall group of scores.

In a distribution with an even number of scores, the median will be the:

Which statement is true for the scores 1, 2, 3, 4, 5, 5, 7, 8, 9, 10, 12, 12, 13?

What is the variance of these three scores: 1, 4, 7?

In a class of students in which everyone is exactly 24 years old, the variance would be:

In statistics, the best measure of the representative value of a group of scores is usually the mode. (True or False)

The mode can be a poor representative value because:

In order to compute the range of a group of scores, one must:

Unless there are __________ , behavioral and social scientists generally use the mean as the measure of the representative value of a group of scores.

In statistical formulas, what does N stand for?

A person's raw score is 7, the mean is 13, and the standard deviation is 3. What is the person's Z score?

Displaying the Order in a Group of Numbers Using Tables and Graphs

Correlation and Prediction

Some Key Ingredients for Inferential Statistics: the Normal Curve, Sample Versus Population, and Probability

Introduction to Hypothesis Testing

Hypothesis Tests With Means of Samples

Making Sense of Statistical Significance: Effect Size and Statistical Power

Introduction to the T Test: Single Sample and Dependent Means

The T Test for Independent Means

Introduction to the Analysis of Variance

Chi-Square Tests and Strategies When Population Distributions Are Not Normal

Applying Statistical Methods in Your Own Research Project

Filters