Question 1

The coefficient of determination is mathematically equivalent to eta-squared.

Accepted Answer

A) True 
 B)False

Question 2

If   = 5.32 and n = 40,then what is the value of the coefficient of determination?

Accepted Answer

A) 0.133 
B) 0.36 
C) 0.64 
D) There is not enough information to answer this question. 
A) 0.133 
B) 0.36 
C) 0.64 
D) There is not enough information to answer this question.

Question 3

The denominator of the correlation coefficient measures the extent to which two variables

Accepted Answer

A) vary together 
B) vary independently 
C) covary 
D) both A and C 
A) vary together 
B) vary independently 
C) covary 
D) both A and C

Question 4

A correlation of r = .38 in a sample of 30 participants is statistically significant for a two-tailed test at a .05 level of significance.

Accepted Answer

A) True 
 B)False

Question 5

A researcher measures the correlation in rankings for a sample of restaurants and consumers' rankings of their favorite restaurants.If   = 96 and n = 12,then what is the value of the correlation coefficient?

Accepted Answer

A) 0.07 
B) 0.34 
C) 0.66 
D) 0.94 
A) 0.07 
B) 0.34 
C) 0.66 
D) 0.94

Question 6

The point-biserial correlation coefficient is used to measure the correlation between two dichotomous variables.

Accepted Answer

A) True 
 B)False

Question 7

The closer that data points fall to the regression line,the more closely two factors are related.

Accepted Answer

A) True 
 B)False

Question 8

A positive correlation is always stronger than a negative correlation.

Accepted Answer

A) True 
 B)False

Question 9

The value of the sum of products can be positive or negative.

Accepted Answer

A) True 
 B)False

Question 10

A researcher computes the following phi correlation coefficient:   = 0.42.If the sample size was 20,then what is the decision for this correlation test?

Accepted Answer

A) Retain the null hypothesis. 
B) Reject the null hypothesis. 
C) There is not enough information to answer this question. 
A) Retain the null hypothesis. 
B) Reject the null hypothesis. 
C) There is not enough information to answer this question.

Question 11

The coefficient of determination is the square root of the correlation coefficient.

Accepted Answer

A) True 
 B)False

Question 12

The following graphs display the data points for two linear correlations.Based on the information provided in these graphs,________ displays a negative correlation and ________ displays a stronger correlation.

Accepted Answer

A) Graph A;Graph B 
B) Graph B;Graph A 
C) Graph A;Graph A 
D) Graph B;Graph B 
A) Graph A;Graph B 
B) Graph B;Graph A 
C) Graph A;Graph A 
D) Graph B;Graph B

Question 13

The phi correlation coefficient is a measure for the direction and strength of the linear relationship between two ________ variables.

Accepted Answer

A) dichotomous 
B) curvilinear 
C) ordinal 
D) significant 
A) dichotomous 
B) curvilinear 
C) ordinal 
D) significant

Question 14

The correlation coefficient ranges from -1.0 to +1.0,with values closer to ±1.0 indicating

Accepted Answer

A) a more positive relationship between two factors 
B) a stronger relationship between two factors 
C) that two factors are less likely to be related 
D) that the correlation is due to outliers 
A) a more positive relationship between two factors 
B) a stronger relationship between two factors 
C) that two factors are less likely to be related 
D) that the correlation is due to outliers

Question 15

Correlation does not show causation.

Accepted Answer

A) True 
 B)False

Question 16

An unanticipated variable not accounted for in a research study that could be causing or associated with observed changes in one or more measured variables is called

Accepted Answer

A) reverse causality 
B) restriction of range 
C) a confound variable 
D) homoscedasticity 
A) reverse causality 
B) restriction of range 
C) a confound variable 
D) homoscedasticity

Question 17

A researcher measures the correlation of the time it take participants to complete two tasks purported to measure the same cognitive skill.Participant times are converted to ranks from fastest to slowest.If   = 165 and n = 20,then what is the decision for this correlation test?

Accepted Answer

A) Retain the null hypothesis. 
B) Reject the null hypothesis. 
C) There is not enough information to answer this question. 
A) Retain the null hypothesis. 
B) Reject the null hypothesis. 
C) There is not enough information to answer this question.

Question 18

Homoscedasticity is the assumption that there is an equal variance of data points dispersed along the regression line.

Accepted Answer

A) True 
 B)False

Question 19

A researcher measures the correlation between gender and student aptitude scores from 0 to 100 among 20 participants.If   = 0.49,then what is the decision for this correlation test?

Accepted Answer

A) Retain the null hypothesis. 
B) Reject the null hypothesis. 
C) There is not enough information to answer this question. 
A) Retain the null hypothesis. 
B) Reject the null hypothesis. 
C) There is not enough information to answer this question.

Question 20

The denominator of the Pearson correlation coefficient measures the extent to which two factors vary together.

Accepted Answer

A) True 
 B)False

The coefficient of determination is mathematically equivalent to eta-squared.

If = 5.32 and n = 40,then what is the value of the coefficient of determination?

The denominator of the correlation coefficient measures the extent to which two variables

A correlation of r = .38 in a sample of 30 participants is statistically significant for a two-tailed test at a .05 level of significance.

A researcher measures the correlation in rankings for a sample of restaurants and consumers' rankings of their favorite restaurants.If = 96 and n = 12,then what is the value of the correlation coefficient?

The point-biserial correlation coefficient is used to measure the correlation between two dichotomous variables.

The closer that data points fall to the regression line,the more closely two factors are related.

A positive correlation is always stronger than a negative correlation.

The value of the sum of products can be positive or negative.

A researcher computes the following phi correlation coefficient: = 0.42.If the sample size was 20,then what is the decision for this correlation test?

The coefficient of determination is the square root of the correlation coefficient.

The following graphs display the data points for two linear correlations.Based on the information provided in these graphs, displays a negative correlation and displays a stronger correlation.

The phi correlation coefficient is a measure for the direction and strength of the linear relationship between two ________ variables.

The correlation coefficient ranges from -1.0 to +1.0,with values closer to ±1.0 indicating

Correlation does not show causation.

An unanticipated variable not accounted for in a research study that could be causing or associated with observed changes in one or more measured variables is called

A researcher measures the correlation of the time it take participants to complete two tasks purported to measure the same cognitive skill.Participant times are converted to ranks from fastest to slowest.If = 165 and n = 20,then what is the decision for this correlation test?

Homoscedasticity is the assumption that there is an equal variance of data points dispersed along the regression line.

A researcher measures the correlation between gender and student aptitude scores from 0 to 100 among 20 participants.If = 0.49,then what is the decision for this correlation test?

The denominator of the Pearson correlation coefficient measures the extent to which two factors vary together.

Introduction to Statistics

Summarizing Data: Frequency Distributions in Tables and Graphs

Summarizing Data: Central Tendency

Summarizing Data: Variability

Probability

Probability, Normal Distributions, and Z Scores

Probability and Sampling Distributions

Hypothesis Testing: Significance, Effect Size, and Power

Testing Means: One-Sample and Two-Independent Sample T Tests

Testing Means: Related Samples T Test

Estimation and Confidence Intervals

Analysis of Variance: One-Way Between-Subjects Design

Analysis of Variance: One-Way Within-Subjects Repeated Measures Design

Analysis of Variance: Two-Way Between-Subjects Factorial Design

Linear Regression and Multiple Regression

Nonparametric Tests: Chi-Square Tests

Nonparametric Tests: Tests for Ordinal Data

Filters

Exam 15: Correlation

The coefficient of determination is mathematically equivalent to eta-squared.

If = 5.32 and n = 40,then what is the value of the coefficient of determination?

The denominator of the correlation coefficient measures the extent to which two variables

A correlation of r = .38 in a sample of 30 participants is statistically significant for a two-tailed test at a .05 level of significance.

A researcher measures the correlation in rankings for a sample of restaurants and consumers' rankings of their favorite restaurants.If = 96 and n = 12,then what is the value of the correlation coefficient?

The point-biserial correlation coefficient is used to measure the correlation between two dichotomous variables.

The closer that data points fall to the regression line,the more closely two factors are related.

A positive correlation is always stronger than a negative correlation.

The value of the sum of products can be positive or negative.

A researcher computes the following phi correlation coefficient: = 0.42.If the sample size was 20,then what is the decision for this correlation test?

The coefficient of determination is the square root of the correlation coefficient.

The following graphs display the data points for two linear correlations.Based on the information provided in these graphs,________ displays a negative correlation and ________ displays a stronger correlation.

The phi correlation coefficient is a measure for the direction and strength of the linear relationship between two ________ variables.

The correlation coefficient ranges from -1.0 to +1.0,with values closer to ±1.0 indicating

Correlation does not show causation.

An unanticipated variable not accounted for in a research study that could be causing or associated with observed changes in one or more measured variables is called

A researcher measures the correlation of the time it take participants to complete two tasks purported to measure the same cognitive skill.Participant times are converted to ranks from fastest to slowest.If = 165 and n = 20,then what is the decision for this correlation test?

Homoscedasticity is the assumption that there is an equal variance of data points dispersed along the regression line.

A researcher measures the correlation between gender and student aptitude scores from 0 to 100 among 20 participants.If = 0.49,then what is the decision for this correlation test?

The denominator of the Pearson correlation coefficient measures the extent to which two factors vary together.

Introduction to Statistics

Summarizing Data: Frequency Distributions in Tables and Graphs

Summarizing Data: Central Tendency

Summarizing Data: Variability

Probability

Probability, Normal Distributions, and Z Scores

Probability and Sampling Distributions

Hypothesis Testing: Significance, Effect Size, and Power

Testing Means: One-Sample and Two-Independent Sample T Tests

Testing Means: Related Samples T Test

Estimation and Confidence Intervals

Analysis of Variance: One-Way Between-Subjects Design

Analysis of Variance: One-Way Within-Subjects Repeated Measures Design

Analysis of Variance: Two-Way Between-Subjects Factorial Design

Linear Regression and Multiple Regression

Nonparametric Tests: Chi-Square Tests

Nonparametric Tests: Tests for Ordinal Data

Filters

The following graphs display the data points for two linear correlations.Based on the information provided in these graphs, displays a negative correlation and displays a stronger correlation.