Question 1

If two variables are significantly correlated, this means that one variable causes the other.

Accepted Answer

Correlation does not imply causation. Just because two variables are strongly related, it does not mean that one causes the other. There may be other variables at play or the relationship may be coincidental.

Question 2

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

Accepted Answer

The answer of Write an example of a null hypothesis...

Question 3

Correlations can be used to examine the differences between groups.

Accepted Answer

Correlations are used to measure the strength and direction of a relationship between two variables. They cannot be used to examine differences between groups, as this requires statistical tests such as t-tests or ANOVA.

Question 4

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 answer of The research hypothesis posits that there will...

Question 5

Write an example of a research hypothesis for a one-tailed t-test for the correlation coefficient.

Accepted Answer

The answer of Write an example of a research hypothesis...

Question 6

The research hypothesis posits that the relationship between two variables will be greater than zero (H₁: rₓᵧ > 0).What would be concluded for r₍₂₉₎ = .467, p < .05?

Accepted Answer

The answer of The research hypothesis posits that the relationship...

Question 7

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

Accepted Answer

The answer of Give an example of a one-tailed hypothesis...

Question 8

Write an example of a research hypothesis for a two-tailed t-test for the correlation coefficient.

Accepted Answer

The answer of Write an example of a research hypothesis...

Question 9

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 answer of The research hypothesis posits that the more...

Question 10

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

Accepted Answer

A correlation can only measure the relationship between two variables. It cannot determine the relationship between three or more variables.

Question 11

A significant correlation indicates a meaningful relationship.

Accepted Answer

A significant correlation means that there is a strong relationship between two variables, and not just due to chance. Therefore, it indicates a meaningful relationship.

Question 12

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

Accepted Answer

The correlation coefficient can be used for both one-tailed and two-tailed tests.

Question 13

Think about the t-test for the correlation coefficient.Write the equations for a research hypothesis with a one-tailed test and for a research hypothesis with a two-tailed test.Write the equation for the null hypothesis.

Accepted Answer

The answer of Think about the t-test for the correlation...

Question 14

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

Accepted Answer

The answer of Give an example of a situation when...

Question 15

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

Accepted Answer

The answer of What are the eight steps involved when...

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