Question 1

Correlation coefficients examine the relationship between variables.

Accepted Answer

A) True 
 B)False

Question 2

In the equation r₍₆₅₎ = .45, p < .05, what is the obtained value?

Accepted Answer

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

Question 3

If a simple Pearson correlation value = .512, what percentage of variance is accounted for?

Accepted Answer

A) 26% 
B) 49% 
C) 51% 
D) 74% 
A) 26% 
B) 49% 
C) 51% 
D) 74%

Question 4

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

One-tailed test H₁: rₓᵧ > 0 or

Question 5

If a research hypothesis posits that there is a nondirect 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 6

A professor hypothesizes that there will be a positive 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 7

If the hypothesis shows no direction, what type of correlation coefficient should we use?

Accepted Answer

A) partial correlation 
B) absolute value 
C) one tailed 
D) two tailed 
A) partial correlation 
B) absolute value 
C) one tailed 
D) two tailed

Question 8

If you posit that a relationship between two variables will be either positive or negative, what type of test should you use?

Accepted Answer

A) two tailed 
B) ANOVA 
C) one tailed 
D) Cohen's d 
A) two tailed 
B) ANOVA 
C) one tailed 
D) Cohen's d

Question 9

If a simple Pearson correlation value = .685, what percentage of variance is accounted for?

Accepted Answer

A) 35% 
B) 47% 
C) 68% 
D) 69% 
A) 35% 
B) 47% 
C) 68% 
D) 69%

Question 10

The correlation between the two variables of interest is .081, which is significant at the .637 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.

Question 11

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

Accepted Answer

An example of a research hypot

Question 12

When computing a correlation coefficient, if you have 36 degrees of freedom, your sample size must be _______.

Accepted Answer

A) 35 
B) 34 
C) 38 
D) 37 
A) 35 
B) 34 
C) 38 
D) 37

Question 13

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

Accepted Answer

An example of a research hypothesis for

Question 14

Correlation coefficients can test _______ variable(s) at a time.

Accepted Answer

A) only one 
B) only two 
C) one or more 
D) two or more 
A) only one 
B) only two 
C) one or more 
D) two or more

Question 15

Which of the following is the appropriate method for calculating the degrees of freedom associated with a correlation coefficient?

Accepted Answer

A) n − 1 
B) n − 2 
C) n − 3 
D) n − 4 
A) n − 1 
B) n − 2 
C) n − 3 
D) n − 4

Correlation coefficients examine the relationship between variables.

In the equation r₍₆₅₎ = .45, p < .05, what is the obtained value?

If a simple Pearson correlation value = .512, what percentage of variance is accounted for?

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.

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

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

If the hypothesis shows no direction, what type of correlation coefficient should we use?

If you posit that a relationship between two variables will be either positive or negative, what type of test should you use?

If a simple Pearson correlation value = .685, what percentage of variance is accounted for?

The correlation between the two variables of interest is .081, which is significant at the .637 level.That means ______.

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

When computing a correlation coefficient, if you have 36 degrees of freedom, your sample size must be _______.

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

Correlation coefficients can test _______ variable(s) at a time.

Which of the following is the appropriate method for calculating the degrees of freedom associated with a correlation coefficient?

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

Correlation coefficients examine the relationship between variables.

In the equation r₍₆₅₎ = .45, p < .05, what is the obtained value?

If a simple Pearson correlation value = .512, what percentage of variance is accounted for?

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.

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

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

If the hypothesis shows no direction, what type of correlation coefficient should we use?

If you posit that a relationship between two variables will be either positive or negative, what type of test should you use?

If a simple Pearson correlation value = .685, what percentage of variance is accounted for?

The correlation between the two variables of interest is .081, which is significant at the .637 level.That means ______.

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

When computing a correlation coefficient, if you have 36 degrees of freedom, your sample size must be _______.

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

Correlation coefficients can test _______ variable(s) at a time.

Which of the following is the appropriate method for calculating the degrees of freedom associated with a correlation coefficient?

Statistics or Sadistics Its up to You

Means to an End: Computing and Understanding Averages

Vive La Différence: Understanding Variability

A Picture Really Is Worth a Thousand Words

Ice Cream and Crime: Computing Correlation Coefficients

Just the Truth: An Introduction to Understanding Reliability and Validity

Hypotheticals and You: Testing Your Questions

Are Your Curves Normal Probability and Why It Counts

Significantly Significant: What It Means for You and Me

Only the Lonely: The One Sample Z-Test

Tea for Two: Tests Between the Means of Different Groups

Tea for Two Again: Tests Between the Means of Related Groups

Two Groups Too Many Try Analysis of Variance

Two Too Many Factors: Factorial Analysis of Variancea Brief Introduction

Predicting Wholl Win the Super Bowl: Using Linear Regression

What to Do When Youre Not Normal: CHI-Square and Some Other Nonparametric Tests

Some Other Important Statistical Procedures You Should Know About

Data Mining: An Introduction to Getting the Most Out of Your Big Data

A Statistical Software Sampler

The Ten or More Best and Most Fun Internet Sites for Statistics Stuff

The Ten Commandments of Data Collection

Filters