Question 1

A significant correlation does not indicate causality.

Accepted Answer

A) True 
 B)False

Question 2

Give an example of a situation when it would be appropriate to use the t-test for the correlation coefficient test statistic.

Accepted Answer

A study comparing the relation

Question 3

What is another term for a negative correlation?

Accepted Answer

A) indirect 
B) nondirectional 
C) direct 
D) unidirectional 
A) indirect 
B) nondirectional 
C) direct 
D) unidirectional

Question 4

A _______ correlation is also known as a _______ correlation.

Accepted Answer

A) negative; direct 
B) negative; nondirectional 
C) positive; direct 
D) positive; nondirectional 
A) negative; direct 
B) negative; nondirectional 
C) positive; direct 
D) positive; nondirectional

Question 5

If the correlation between two variables is .496, how much of the variance has not been accounted for?

Accepted Answer

A) 24.6% 
B) 49.6% 
C) 50.4% 
D) 75.4% 
A) 24.6% 
B) 49.6% 
C) 50.4% 
D) 75.4%

Question 6

Give an example of a one-tailed hypothesis that may be tested through a correlation.

Accepted Answer

Example: Higher crim

Question 7

The appropriate test statistic to use is the _______.

Accepted Answer

A) t-test for the correlation coefficient 
B) p-test for the correlation coefficient 
C) r-test for the correlation coefficient 
D) t-test for statistical significance 
A) t-test for the correlation coefficient 
B) p-test for the correlation coefficient 
C) r-test for the correlation coefficient 
D) t-test for statistical significance

Question 8

With regard to correlations, tests can be either directional or nondirectional.

Accepted Answer

A) True 
 B)False

Question 9

What does the statement rₓᵧ ≠ 0 represent?

Accepted Answer

A) null hypothesis 
B) t statistic 
C) mean difference 
D) research hypothesis 
A) null hypothesis 
B) t statistic 
C) mean difference 
D) research hypothesis

Question 10

A single correlation can be computed in order to determine the relationship between three variables.

Accepted Answer

A) True 
 B)False

Question 11

Which of the following indicates a nonsignificant correlation?

Accepted Answer

A) p < .05 
B) p < .01 
C) p = .02 
D) p = .30 
A) p < .05 
B) p < .01 
C) p = .02 
D) p = .30

Question 12

Write an example of a null hypothesis for a t-test for the correlation coefficient.

Accepted Answer

An example of a null hypothesi

Question 13

What is the most important characteristic of a correlation coefficient?

Accepted Answer

A) number of variables included 
B) absolute value 
C) one tailed 
D) two tailed 
A) number of variables included 
B) absolute value 
C) one tailed 
D) two tailed

Question 14

If the correlation between two variables is .876, how much of the variance has been accounted for?

Accepted Answer

A) 24.6% 
B) 49.6% 
C) 59.1% 
D) 76.7% 
A) 24.6% 
B) 49.6% 
C) 59.1% 
D) 76.7%

Question 15

The research hypothesis posits that the more caffeine consumed by a subject, the longer a subject will stay awake (H₁: rₓᵧ > 0).What would be concluded for r₍₁₀₎= .653, p < .05?

Accepted Answer

The obtained value (.653) is greater tha

Question 16

If a research hypothesis predicts the direction of a relationship, the test is _______.

Accepted Answer

A) one tailed 
B) two tailed 
C) direct 
D) positive 
A) one tailed 
B) two tailed 
C) direct 
D) positive

Question 17

The appropriate test statistic to use is the t-test for the correlation coefficient.

Accepted Answer

A) True 
 B)False

Question 18

In the equation r₍₆₅₎ = .45, p < .05, what does r represent?

Accepted Answer

A) observed statistic 
B) experimental statistic 
C) test statistic 
D) critical statistic 
A) observed statistic 
B) experimental statistic 
C) test statistic 
D) critical statistic

Question 19

When computing the correlation coefficient, the _______ between variables, not the _______ between groups, is being examined.

Accepted Answer

A) relationship; difference 
B) difference; relationship 
C) means, reliability 
D) reliability; means 
A) relationship; difference 
B) difference; relationship 
C) means, reliability 
D) reliability; means

Question 20

What is another term for an indirect correlation?

Accepted Answer

A) negative 
B) nondirectional 
C) positive 
D) unidirectional 
A) negative 
B) nondirectional 
C) positive 
D) unidirectional

Exam 15: Cousins or Just Good Friends Testing Relationships Using Correlation Coefficient

A significant correlation does not indicate causality.

Give an example of a situation when it would be appropriate to use the t-test for the correlation coefficient test statistic.

What is another term for a negative correlation?

A _______ correlation is also known as a _______ correlation.

If the correlation between two variables is .496, how much of the variance has not been accounted for?

Give an example of a one-tailed hypothesis that may be tested through a correlation.

The appropriate test statistic to use is the _______.

With regard to correlations, tests can be either directional or nondirectional.

What does the statement rₓᵧ ≠ 0 represent?

A single correlation can be computed in order to determine the relationship between three variables.

Which of the following indicates a nonsignificant correlation?

Write an example of a null hypothesis for a t-test for the correlation coefficient.

What is the most important characteristic of a correlation coefficient?

If the correlation between two variables is .876, how much of the variance has been accounted for?

The research hypothesis posits that the more caffeine consumed by a subject, the longer a subject will stay awake (H₁: rₓᵧ > 0).What would be concluded for r₍₁₀₎= .653, p < .05?

If a research hypothesis predicts the direction of a relationship, the test is _______.

The appropriate test statistic to use is the t-test for the correlation coefficient.

In the equation r₍₆₅₎ = .45, p < .05, what does r represent?

When computing the correlation coefficient, the _______ between variables, not the _______ between groups, is being examined.

What is another term for an indirect correlation?

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Filters

A _ correlation is also known as a _ correlation.

When computing the correlation coefficient, the _ between variables, not the _ between groups, is being examined.