Question 1

A distribution can have more than one mode.

Accepted Answer

A) True 
 B)False

Question 2

Conceptually, what is the standard deviation?

Accepted Answer

A)  The average amount that the scores in a distribution differ from the mean. 
B)  The difference between the highest and lowest scores in a distribution. 
C)  The mean of the squared scores. 
D)  Half the difference between the highest and lowest scores in a distribution. 
A)  The average amount that the scores in a distribution differ from the mean. 
B)  The difference between the highest and lowest scores in a distribution. 
C)  The mean of the squared scores. 
D)  Half the difference between the highest and lowest scores in a distribution.

Question 3

A researcher shows that doctors who act more confidently are liked better by their patients … but only up to a point. If they act too confidently, their patients start to like them less. Which of the following best describes this result?

Accepted Answer

A)  There is no relationship between physician confidence and patient liking. 
B)  The relationship between physician confidence and patient liking is nonlinear. 
C)  There is a strong negative relationship between physician confidence and patient liking. 
D)  It is a bimodal distribution 
A)  There is no relationship between physician confidence and patient liking. 
B)  The relationship between physician confidence and patient liking is nonlinear. 
C)  There is a strong negative relationship between physician confidence and patient liking. 
D)  It is a bimodal distribution

Question 4

Which of the following describes Pearson's r?

Accepted Answer

A)  It is the average amount by which the scores in two sets of data differ from each other. 
B)  It is the cross-product of two variances. 
C)  It is average difference between X and Y, divided by N. 
D)  It is the mean cross-product of two sets of z scores. 
A)  It is the average amount by which the scores in two sets of data differ from each other. 
B)  It is the cross-product of two variances. 
C)  It is average difference between X and Y, divided by N. 
D)  It is the mean cross-product of two sets of z scores.

Question 5

Pearson's r is NOT appropriate for which of the following?

Accepted Answer

A)  negative relationships 
B)  nonlinear relationships 
C)  weak relationships 
D)  extremely strong relationships 
A)  negative relationships 
B)  nonlinear relationships 
C)  weak relationships 
D)  extremely strong relationships

Question 6

In a negatively skewed distribution, most scores are above the mean.

Accepted Answer

A) True 
 B)False

Question 7

If Esther has a z score of -0.10 on a test of reading ability, which of the following is true?

Accepted Answer

A)  Esther has an extremely low reading ability. 
B)  Esther's reading ability is close to the average. 
C)  The test is biased against girls. 
D)  A mistake was made in computing her z score. 
A)  Esther has an extremely low reading ability. 
B)  Esther's reading ability is close to the average. 
C)  The test is biased against girls. 
D)  A mistake was made in computing her z score.

Question 8

Which of the following is true of outliers?

Accepted Answer

A)  They must be removed from the data. 
B)  They must be included in the final analyses. 
C)  They invalidate the results of a study. 
D)  Their removal should have a reasonable justification. 
A)  They must be removed from the data. 
B)  They must be included in the final analyses. 
C)  They invalidate the results of a study. 
D)  Their removal should have a reasonable justification.

Question 9

A research methods instructor gives an exam. Assuming this instructor wants the students to do well, would he or she prefer to see a positively skewed distribution of scores or a negatively skewed distribution of scores? Explain why.

Accepted Answer

The instructor would prefer to

Question 10

In a positively skewed distribution, most scores are above the mean.

Accepted Answer

A) True 
 B)False

Question 11

Which of the following would fall into the category of "preliminary analyses?"

Accepted Answer

A)  computing Cronbach's alpha for your dependent variables 
B)  checking for outliers 
C)  examining the distributions of your dependent variables 
D)  all of the above 
A)  computing Cronbach's alpha for your dependent variables 
B)  checking for outliers 
C)  examining the distributions of your dependent variables 
D)  all of the above

Question 12

What is the median for the set of data below?

Accepted Answer

A)  5 
B)  8 
C)  8.5 
D)  49.5 
A)  5 
B)  8 
C)  8.5 
D)  49.5

Question 13

A distribution with two distinct peaks is called binomial.

Accepted Answer

A) True 
 B)False

Question 14

Jane computes the variance for a set of data and gets the correct answer of 16. What is the standard deviation for this same set of data?

Accepted Answer

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

Question 15

Which of the following represents the strongest statistical relationship?

Accepted Answer

A)  d = 0.80 
B)  r = - .40 
C)  r = + .40 
D)  d = 0.10 
A)  d = 0.80 
B)  r = - .40 
C)  r = + .40 
D)  d = 0.10

Question 16

There is a statistical relationship between two variables if which of the following is true?

Accepted Answer

A)  The variables are measured on the same scale. 
B)  One of the variables has a higher mean than the other. 
C)  The average level of one variable differs across levels of the other. 
D)  The variables are conceptually similar (e.g., intelligence and common sense). 
A)  The variables are measured on the same scale. 
B)  One of the variables has a higher mean than the other. 
C)  The average level of one variable differs across levels of the other. 
D)  The variables are conceptually similar (e.g., intelligence and common sense).

Question 17

The mean score on a test of agreeableness is 27 with a standard deviation of 8. Rudolfo got a score of 25 on this test. What is his z score?

Accepted Answer

A)  -0.25 
B)  -0.40 
C)  -2.00 
D)  There is not enough information to tell. 
A)  -0.25 
B)  -0.40 
C)  -2.00 
D)  There is not enough information to tell.

Question 18

Pearson's r is an appropriate measure for both linear and nonlinear relationships.

Accepted Answer

A) True 
 B)False

Question 19

Identify two psychological variables that you think are probably statistically related. If you were to collect data on this relationship, which measure of relationship strength (d or r) would you use to describe it? What value of d or r would you expect and why?

Accepted Answer

Two psychological variables that are pro

Question 20

What is plotted on the Y-axis of a histogram?

Accepted Answer

A)  the mean score 
B)  the variable of interest 
C)  the participants' names 
D)  the frequency of each score 
A)  the mean score 
B)  the variable of interest 
C)  the participants' names 
D)  the frequency of each score

A distribution can have more than one mode.

Conceptually, what is the standard deviation?

A researcher shows that doctors who act more confidently are liked better by their patients … but only up to a point. If they act too confidently, their patients start to like them less. Which of the following best describes this result?

Which of the following describes Pearson's r?

Pearson's r is NOT appropriate for which of the following?

In a negatively skewed distribution, most scores are above the mean.

If Esther has a z score of -0.10 on a test of reading ability, which of the following is true?

Which of the following is true of outliers?

A research methods instructor gives an exam. Assuming this instructor wants the students to do well, would he or she prefer to see a positively skewed distribution of scores or a negatively skewed distribution of scores? Explain why.

In a positively skewed distribution, most scores are above the mean.

Which of the following would fall into the category of "preliminary analyses?"

What is the median for the set of data below?

A distribution with two distinct peaks is called binomial.

Jane computes the variance for a set of data and gets the correct answer of 16. What is the standard deviation for this same set of data?

Which of the following represents the strongest statistical relationship?

There is a statistical relationship between two variables if which of the following is true?

The mean score on a test of agreeableness is 27 with a standard deviation of 8. Rudolfo got a score of 25 on this test. What is his z score?

Pearson's r is an appropriate measure for both linear and nonlinear relationships.

Identify two psychological variables that you think are probably statistically related. If you were to collect data on this relationship, which measure of relationship strength (d or r) would you use to describe it? What value of d or r would you expect and why?

What is plotted on the Y-axis of a histogram?

The Science of Psychology

Getting Started in Research

Research Ethics

Theory in Psychology

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Exam 12: Descriptive Statistics

A distribution can have more than one mode.

Conceptually, what is the standard deviation?

A researcher shows that doctors who act more confidently are liked better by their patients … but only up to a point. If they act too confidently, their patients start to like them less. Which of the following best describes this result?

Which of the following describes Pearson's r?

Pearson's r is NOT appropriate for which of the following?

In a negatively skewed distribution, most scores are above the mean.

If Esther has a z score of -0.10 on a test of reading ability, which of the following is true?

Which of the following is true of outliers?

A research methods instructor gives an exam. Assuming this instructor wants the students to do well, would he or she prefer to see a positively skewed distribution of scores or a negatively skewed distribution of scores? Explain why.

In a positively skewed distribution, most scores are above the mean.

Which of the following would fall into the category of "preliminary analyses?"

What is the median for the set of data below?

A distribution with two distinct peaks is called binomial.

Jane computes the variance for a set of data and gets the correct answer of 16. What is the standard deviation for this same set of data?

Which of the following represents the strongest statistical relationship?

There is a statistical relationship between two variables if which of the following is true?

The mean score on a test of agreeableness is 27 with a standard deviation of 8. Rudolfo got a score of 25 on this test. What is his z score?

Pearson's r is an appropriate measure for both linear and nonlinear relationships.

Identify two psychological variables that you think are probably statistically related. If you were to collect data on this relationship, which measure of relationship strength (d or r) would you use to describe it? What value of d or r would you expect and why?

What is plotted on the Y-axis of a histogram?

The Science of Psychology

Getting Started in Research

Research Ethics

Theory in Psychology

Psychological Measurement

Experimental Research

Nonexperimental Research

Complex Research Designs

Survey Research

Single-Subject Research

Presenting Your Research

Inferential Statistics

Filters