Question 1

When a researcher selects a nonrepresentative sample, they have committed a sampling error.

Accepted Answer

A) True 
 B)False  False

Question 2

Which of the following is true of a study with inadequate statistical power?

Accepted Answer

A)  It is likely to result in a Type I error. 
B)  It has a good chance of producing a Type II error. 
C)  The relationship in the sample will almost certainly be extremely weak. 
D)  The null hypothesis will probably be rejected. 
A)  It is likely to result in a Type I error. 
B)  It has a good chance of producing a Type II error. 
C)  The relationship in the sample will almost certainly be extremely weak. 
D)  The null hypothesis will probably be rejected. B

Question 3

The mean extroversion score for a population of people is a parameter.

Accepted Answer

A) True 
 B)False  True

Question 4

If you conduct a null hypothesis correctly, then the conclusion you draw is guaranteed to be correct.

Accepted Answer

A) True 
 B)False

Question 5

The purpose of null hypothesis testing is to decide whether or not a sample result reflects a real relationship in the population.

Accepted Answer

A) True 
 B)False

Question 6

Imagine you conduct a study and find that the correlation between the height of female college students and the heights of their boyfriends is +.36 and that the p value for this correlation is .02. This p value is the probability of something. But what is it the probability of?

Accepted Answer

It is the probabilit

Question 7

The file drawer problem is caused partly by which of the following?

Accepted Answer

A)  universities rewarding researchers for conducting lots of research 
B)  too much statistical power on the part of journal editors 
C)  scientists' skeptical attitude toward new results 
D)  journal editors' preference for publishing significant results 
A)  universities rewarding researchers for conducting lots of research 
B)  too much statistical power on the part of journal editors 
C)  scientists' skeptical attitude toward new results 
D)  journal editors' preference for publishing significant results

Question 8

Researchers in psychology usually set alpha to which of the following values?

Accepted Answer

A)  .05 
B)  .50 
C)  .01 
D)  .10 
A)  .05 
B)  .50 
C)  .01 
D)  .10

Question 9

A strong relationship based on a large sample will be statistically significant.

Accepted Answer

A) True 
 B)False

Question 10

What does it mean if the result of your study is "not statistically significant?"

Accepted Answer

A)  You reject the null hypothesis. 
B)  The result represents a "real" result that is true in the population. 
C)  The result is was due to sampling error. 
D)  The result is unimportant. 
A)  You reject the null hypothesis. 
B)  The result represents a "real" result that is true in the population. 
C)  The result is was due to sampling error. 
D)  The result is unimportant.

Question 11

What null hypothesis test would you use to compare the mean empathy levels of three-year-olds and five-year-olds? Why?

Accepted Answer

One would use a two-

Question 12

What is a Type I error and how can it occur even though the researcher conducts the null hypothesis test correctly?

Accepted Answer

A Type I error occurs when the researche

Question 13

The p value is the probability of a sample result as extreme as the one you found-if the null hypothesis were true.

Accepted Answer

A) True 
 B)False

Question 14

In psychological research, alpha is usually set to .05.

Accepted Answer

A) True 
 B)False

Question 15

Researchers usually hope to reject the null hypothesis.

Accepted Answer

A) True 
 B)False

Question 16

When a researcher rejects the null hypothesis, he or she is concluding that there is a relationship between two variables.

Accepted Answer

A) True 
 B)False

Question 17

Fred conducts a paired-samples t test. His critical t value is 2.36 and his actual t value is 4.17. Which of the following is true?

Accepted Answer

A)  He should have conducted a two-sample t test. 
B)  His p value is greater than .05. 
C)  He should reject the null hypothesis. 
D)  He should fail to reject the null hypothesis. 
A)  He should have conducted a two-sample t test. 
B)  His p value is greater than .05. 
C)  He should reject the null hypothesis. 
D)  He should fail to reject the null hypothesis.

Question 18

A student researcher finds a Pearson's r of +.75 for a sample of 240 people. Even without doing a formal null hypothesis test, what can you tell her about her result?

Accepted Answer

A)  The result was probably due to chance. 
B)  The result is statistically significant. 
C)  The null hypothesis is true. 
D)  She made a mistake in computing Pearson's r. 
A)  The result was probably due to chance. 
B)  The result is statistically significant. 
C)  The null hypothesis is true. 
D)  She made a mistake in computing Pearson's r.

Question 19

Statistically significant results are more likely to be published than statistically nonsignificant results.

Accepted Answer

A) True 
 B)False

Question 20

If the value of Pearson's r in your sample is .45, what should you do?

Accepted Answer

A)  reject the null hypothesis 
B)  fail to reject the null hypothesis 
C)  recompute Pearson's r because you must have made a mistake 
D)  There is not enough information to know what to do. 
A)  reject the null hypothesis 
B)  fail to reject the null hypothesis 
C)  recompute Pearson's r because you must have made a mistake 
D)  There is not enough information to know what to do.

When a researcher selects a nonrepresentative sample, they have committed a sampling error.

Which of the following is true of a study with inadequate statistical power?

The mean extroversion score for a population of people is a parameter.

If you conduct a null hypothesis correctly, then the conclusion you draw is guaranteed to be correct.

The purpose of null hypothesis testing is to decide whether or not a sample result reflects a real relationship in the population.

Imagine you conduct a study and find that the correlation between the height of female college students and the heights of their boyfriends is +.36 and that the p value for this correlation is .02. This p value is the probability of something. But what is it the probability of?

The file drawer problem is caused partly by which of the following?

Researchers in psychology usually set alpha to which of the following values?

A strong relationship based on a large sample will be statistically significant.

What does it mean if the result of your study is "not statistically significant?"

What null hypothesis test would you use to compare the mean empathy levels of three-year-olds and five-year-olds? Why?

What is a Type I error and how can it occur even though the researcher conducts the null hypothesis test correctly?

The p value is the probability of a sample result as extreme as the one you found-if the null hypothesis were true.

In psychological research, alpha is usually set to .05.

Researchers usually hope to reject the null hypothesis.

When a researcher rejects the null hypothesis, he or she is concluding that there is a relationship between two variables.

Fred conducts a paired-samples t test. His critical t value is 2.36 and his actual t value is 4.17. Which of the following is true?

A student researcher finds a Pearson's r of +.75 for a sample of 240 people. Even without doing a formal null hypothesis test, what can you tell her about her result?

Statistically significant results are more likely to be published than statistically nonsignificant results.

If the value of Pearson's r in your sample is .45, what should you do?

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

Descriptive Statistics

Filters

Exam 13: Inferential Statistics

When a researcher selects a nonrepresentative sample, they have committed a sampling error.

Which of the following is true of a study with inadequate statistical power?

The mean extroversion score for a population of people is a parameter.

If you conduct a null hypothesis correctly, then the conclusion you draw is guaranteed to be correct.

The purpose of null hypothesis testing is to decide whether or not a sample result reflects a real relationship in the population.

Imagine you conduct a study and find that the correlation between the height of female college students and the heights of their boyfriends is +.36 and that the p value for this correlation is .02. This p value is the probability of something. But what is it the probability of?

The file drawer problem is caused partly by which of the following?

Researchers in psychology usually set alpha to which of the following values?

A strong relationship based on a large sample will be statistically significant.

What does it mean if the result of your study is "not statistically significant?"

What null hypothesis test would you use to compare the mean empathy levels of three-year-olds and five-year-olds? Why?

What is a Type I error and how can it occur even though the researcher conducts the null hypothesis test correctly?

The p value is the probability of a sample result as extreme as the one you found-if the null hypothesis were true.

In psychological research, alpha is usually set to .05.

Researchers usually hope to reject the null hypothesis.

When a researcher rejects the null hypothesis, he or she is concluding that there is a relationship between two variables.

Fred conducts a paired-samples t test. His critical t value is 2.36 and his actual t value is 4.17. Which of the following is true?

A student researcher finds a Pearson's r of +.75 for a sample of 240 people. Even without doing a formal null hypothesis test, what can you tell her about her result?

Statistically significant results are more likely to be published than statistically nonsignificant results.

If the value of Pearson's r in your sample is .45, what should you do?

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

Descriptive Statistics

Filters