Question 1

If the coefficient of determination is .767, what is correlation between the two variables?

Accepted Answer

A) .246 
B) .496 
C) .504 
D) .876 
A) .246 
B) .496 
C) .504 
D) .876

Question 2

If you do not predict 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 3

The level of risk or Type I error typically set for testing the level of significance of a correlation coefficient is which of the following?

Accepted Answer

A) .01 
B) .05 
C) .95 
D) .99 
A) .01 
B) .05 
C) .95 
D) .99

Question 4

A significant correlation indicates a meaningful relationship.

Accepted Answer

A) True 
 B)False

Question 5

While you can use the correlation coefficient as its own test statistic, what is the other appropriate test statistic often used to examine the significance of a correlation?

Accepted Answer

A) F-test 
B) Cohen's d 
C) t-test 
D) ꞃ² 
A) F-test 
B) Cohen's d 
C) t-test 
D) ꞃ²

Question 6

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

Accepted Answer

A) True 
 B)False

Question 7

If a simple Pearson correlation value = .75, what percentage of variance is unaccounted for?

Accepted Answer

A) 25% 
B) 44% 
C) 56% 
D) 75% 
A) 25% 
B) 44% 
C) 56% 
D) 75%

Question 8

What is another term for a direct correlation?

Accepted Answer

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

Question 9

Which of the following indicates a significant correlation?

Accepted Answer

A) p = .21 
B) p < .05 
C) p < .20 
D) p < .50 
A) p = .21 
B) p < .05 
C) p < .20 
D) p < .50

Question 10

If you were looking to examine the relationship between chocolate sales and student happiness, you could test the relationship using the _______.

Accepted Answer

A) mean difference 
B) t statistic 
C) error difference 
D) c statistic 
A) mean difference 
B) t statistic 
C) error difference 
D) c statistic

Question 11

Significant correlations are not able to indicate _______.

Accepted Answer

A) the probability level 
B) the size of the effect 
C) causality 
D) the strength of the effect 
A) the probability level 
B) the size of the effect 
C) causality 
D) the strength of the effect

Question 12

Which of the following indicates a very significant correlation?

Accepted Answer

A) p = .05 
B) p < .05 
C) p < .01 
D) p < .50 
A) p = .05 
B) p < .05 
C) p < .01 
D) p < .50

Question 13

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 obtained value (.467) is greater tha

Question 14

What is the name of the Greek letter ρ?

Accepted Answer

A) phi 
B) rho 
C) chi 
D) alpha 
A) phi 
B) rho 
C) chi 
D) alpha

Question 15

In the formula for calculating degrees of freedom for a correlation coefficient, what does the n represent?

Accepted Answer

A) sample size 
B) number of groups 
C) number of pairs 
D) population 
A) sample size 
B) number of groups 
C) number of pairs 
D) population

Question 16

If the accounted variance is 24.2%, what is the correlation between the two variables?

Accepted Answer

A) 24.6% 
B) 49.2% 
C) 50.4% 
D) 75.4% 
A) 24.6% 
B) 49.2% 
C) 50.4% 
D) 75.4%

Question 17

Correlations can be _______.

Accepted Answer

A) directional or nondirectional 
B) only directional 
C) only nondirectional 
D) neither directional nor nondirectional 
A) directional or nondirectional 
B) only directional 
C) only nondirectional 
D) neither directional nor nondirectional

Question 18

This chapter illustrates that you can also incorporate _____ into the correlation coefficient.

Accepted Answer

A) statistical significance 
B) substantial significance 
C) descriptive statistics 
D) generalizability 
A) statistical significance 
B) substantial significance 
C) descriptive statistics 
D) generalizability

Question 19

A ______ correlation is also known as a ______ correlation.

Accepted Answer

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

Question 20

Statistically significant correlations cannot show _______.

Accepted Answer

A) the probability level 
B) the size of the effect 
C) causality 
D) the strength of the effect 
A) the probability level 
B) the size of the effect 
C) causality 
D) the strength of the effect

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

If the coefficient of determination is .767, what is correlation between the two variables?

If you do not predict that a relationship between two variables will be either positive or negative, what type of test should you use?

The level of risk or Type I error typically set for testing the level of significance of a correlation coefficient is which of the following?

A significant correlation indicates a meaningful relationship.

While you can use the correlation coefficient as its own test statistic, what is the other appropriate test statistic often used to examine the significance of a correlation?

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

If a simple Pearson correlation value = .75, what percentage of variance is unaccounted for?

What is another term for a direct correlation?

Which of the following indicates a significant correlation?

If you were looking to examine the relationship between chocolate sales and student happiness, you could test the relationship using the _______.

Significant correlations are not able to indicate _______.

Which of the following indicates a very significant correlation?

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?

What is the name of the Greek letter ρ?

In the formula for calculating degrees of freedom for a correlation coefficient, what does the n represent?

If the accounted variance is 24.2%, what is the correlation between the two variables?

Correlations can be _______.

This chapter illustrates that you can also incorporate _____ into the correlation coefficient.

A ______ correlation is also known as a ______ correlation.

Statistically significant correlations cannot show _______.

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

A correlation is also known as a correlation.