Question 1

When computing a correlation coefficient, if you have 55 degrees of freedom, your sample size must be _______.

Accepted Answer

A) 55 
B) 53 
C) 56 
D) 57 
A) 55 
B) 53 
C) 56 
D) 57 D

Question 2

The research hypothesis posits that there will be a relationship between the number of hours a student studies and their result on a test (H₁: rₓᵧ ≠ 0).What would be concluded for r₍₄₅₎ = .213, p > .05?

Accepted Answer

The obtained value (.213) is less than the critical value (.2875), so it cannot be concluded that the relationship between the two variables occurred by something other than chance.Furthermore, the research hypothesis, which posits a relationship between the variables, is also not supported.

Question 3

If the correlation between two variables is .496, what is the coefficient of determination?

Accepted Answer

A) .246 
B) .496 
C) .504 
D) .754 
A) .246 
B) .496 
C) .504 
D) .754 A

Question 4

If a research hypothesis posits that there is a direct relationship between two variables, the test is _______.

Accepted Answer

A) one tailed 
B) two tailed 
C) negative 
D) nondirectional 
A) one tailed 
B) two tailed 
C) negative 
D) nondirectional

Question 5

In the equation r₍₆₅₎ = .45, p < .05, what are the degrees of freedom?

Accepted Answer

A) .45 
B) 45 
C) .65 
D) 65 
A) .45 
B) 45 
C) .65 
D) 65

Question 6

If the correlation between two variables is .767, how much variance has not been accounted for?

Accepted Answer

A) .246 
B) .412 
C) .588 
D) .876 
A) .246 
B) .412 
C) .588 
D) .876

Question 7

If a simple Pearson correlation value = .362, what percentage of variance is unaccounted for?

Accepted Answer

A) 25% 
B) 36% 
C) 56% 
D) 87% 
A) 25% 
B) 36% 
C) 56% 
D) 87%

Question 8

A correlation coefficient can only test one variable at a time.

Accepted Answer

A) True 
 B)False

Question 9

Which of the following is another use of correlation coefficients?

Accepted Answer

A) testing mean differences 
B) testing causal relationships 
C) estimating reliability 
D) estimating power 
A) testing mean differences 
B) testing causal relationships 
C) estimating reliability 
D) estimating power

Question 10

What are the eight steps involved when examining a research question?

Accepted Answer

Step 1: State the null and research hypo

Question 11

Correlation coefficients examine ______.

Accepted Answer

A) differences between two groups 
B) differences between two or more groups 
C) the relationship between variables 
D) how variables can be arranged into higher-order factors 
A) differences between two groups 
B) differences between two or more groups 
C) the relationship between variables 
D) how variables can be arranged into higher-order factors

Question 12

If a research hypothesis does not predict 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 13

The correlation coefficient is a measure of _______.

Accepted Answer

A) mean differences 
B) causation 
C) prediction 
D) association 
A) mean differences 
B) causation 
C) prediction 
D) association

Question 14

The correlation coefficient can only be used for one-tailed tests.

Accepted Answer

A) True 
 B)False

Question 15

What is another term for a positive correlation?

Accepted Answer

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

Question 16

You would like to examine the association between temperature and frozen yogurt sales.You hypothesize that higher temperatures will be associated with increased frozen yogurt sales.You have a _______.

Accepted Answer

A) one-tailed hypothesis 
B) two-tailed hypothesis 
C) nondirectional hypothesis 
D) invalid hypothesis 
A) one-tailed hypothesis 
B) two-tailed hypothesis 
C) nondirectional hypothesis 
D) invalid hypothesis

Question 17

A professor hypothesizes that there will be a relationship between couples' listening skills and length of marriage.She has a _______.

Accepted Answer

A) one-tailed hypothesis 
B) invalid hypothesis 
C) valid hypothesis 
D) two-tailed hypothesis 
A) one-tailed hypothesis 
B) invalid hypothesis 
C) valid hypothesis 
D) two-tailed hypothesis

Question 18

When computing a correlation coefficient, if you have 27 degrees of freedom, your sample size must be _______.

Accepted Answer

A) 29 
B) 27 
C) 25 
D) 26 
A) 29 
B) 27 
C) 25 
D) 26

Question 19

Correlations can be used to examine the differences between groups.

Accepted Answer

A) True 
 B)False

Question 20

The correlation between the two variables of interest is .81, which is significant at the .0337 level.That means ______.

Accepted Answer

A) The null hypothesis is rejected. 
B) The research hypothesis is accepted. 
C) The null hypothesis is accepted. 
D) It cannot be determined. 
A) The null hypothesis is rejected. 
B) The research hypothesis is accepted. 
C) The null hypothesis is accepted. 
D) It cannot be determined.

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

When computing a correlation coefficient, if you have 55 degrees of freedom, your sample size must be _______.

The research hypothesis posits that there will be a relationship between the number of hours a student studies and their result on a test (H₁: rₓᵧ ≠ 0).What would be concluded for r₍₄₅₎ = .213, p > .05?

If the correlation between two variables is .496, what is the coefficient of determination?

If a research hypothesis posits that there is a direct relationship between two variables, the test is _______.

In the equation r₍₆₅₎ = .45, p < .05, what are the degrees of freedom?

If the correlation between two variables is .767, how much variance has not been accounted for?

If a simple Pearson correlation value = .362, what percentage of variance is unaccounted for?

A correlation coefficient can only test one variable at a time.

Which of the following is another use of correlation coefficients?

What are the eight steps involved when examining a research question?

Correlation coefficients examine ______.

If a research hypothesis does not predict the direction of a relationship, the test is _______.

The correlation coefficient is a measure of _______.

The correlation coefficient can only be used for one-tailed tests.

What is another term for a positive correlation?

You would like to examine the association between temperature and frozen yogurt sales.You hypothesize that higher temperatures will be associated with increased frozen yogurt sales.You have a _______.

A professor hypothesizes that there will be a relationship between couples' listening skills and length of marriage.She has a _______.

When computing a correlation coefficient, if you have 27 degrees of freedom, your sample size must be _______.

Correlations can be used to examine the differences between groups.

The correlation between the two variables of interest is .81, which is significant at the .0337 level.That means ______.

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