Question 1

The formula for the point-biserial correlation coefficient was derived from the formula for the Pearson correlation coefficient.

Accepted Answer

A) True 
 B)False

Question 2

The Spearman rank-order correlation coefficient is a measure of the direction and strength of the linear relationship between two ______ variables.

Accepted Answer

A)  nominal 
B)  ordinal 
C)  interval 
D)  ratio 
A)  nominal 
B)  ordinal 
C)  interval 
D)  ratio

Question 3

A researcher determines that $\chi$2 = 3.56 to test for significance for a phi correlation coefficient.What was the decision for this phi 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 4

Outliers can change the ______ of a correlation.

Accepted Answer

A)  direction 
B)  strength 
C)  sign (+, -) 
D)  all of these 
A)  direction 
B)  strength 
C)  sign (+, -) 
D)  all of these

Question 5

The coefficient of determination is mathematically equivalent to $\eta$2.

Accepted Answer

A) True 
 B)False

Question 6

Linearity is the assumption that the best way to describe a pattern of data is using a straight line.

Accepted Answer

A) True 
 B)False

Question 7

A researcher observes a correlation of values from 2 to 10 points and draws conclusions about the full range of values in the population from 0 to 21 points.Which limitation for correctly interpreting a correlation coefficient did the researcher violate?

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 8

Which of the following is a limitation for interpreting a correlation?

Accepted Answer

A)  Correlations do not demonstrate cause-and-effect. 
B)  Outliers can change the direction and/or strength of the correlation. 
C)  Conclusions should not be drawn beyond the range of scores measured. 
D)  All of these. 
A)  Correlations do not demonstrate cause-and-effect. 
B)  Outliers can change the direction and/or strength of the correlation. 
C)  Conclusions should not be drawn beyond the range of scores measured. 
D)  All of these.

Question 9

The phi correlation coefficient is used to measure the correlation between two ordinal variables.

Accepted Answer

A) True 
 B)False

Question 10

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)  .07 
B)  .34 
C)  .66 
D)  .94 
A)  .07 
B)  .34 
C)  .66 
D)  .94

Question 11

Select the description below that identifies the following correlation: r = .28,p < .01.

Accepted Answer

A)  The correlation is positive. 
B)  The correlation is statistically significant. 
C)  The coefficient of determination is .08. 
D)  All of these. 
A)  The correlation is positive. 
B)  The correlation is statistically significant. 
C)  The coefficient of determination is .08. 
D)  All of these.

Question 12

Which of the following indicates the strongest correlation?

Accepted Answer

A)  r = -0.57 
B)  r = +0.78 
C)  r = -0.90 
D)  r = +0.88 
A)  r = -0.57 
B)  r = +0.78 
C)  r = -0.90 
D)  r = +0.88

Question 13

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 14

To summarize correlations,we report the strength,the direction,and the p value for each correlation coefficient.

Accepted Answer

A) True 
 B)False

Question 15

If r = .25,then the coefficient of determination is .06.

Accepted Answer

A) True 
 B)False

Question 16

A researcher measures the correlation between the frequency of self-esteem (high,low)and health status (lean/healthy,overweight/obese).Based on the frequencies for each nominal category given below,what is the value of the phi correlation coefficient?

Accepted Answer

A)  .08 
B)  .28 
C)  .52 
D)  .56 
A)  .08 
B)  .28 
C)  .52 
D)  .56

Question 17

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 18

The correlation coefficient can be converted to a t statistic.

Accepted Answer

A) True 
 B)False

Question 19

The coefficient of determination is a measure of significance.

Accepted Answer

A) True 
 B)False

Question 20

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

Accepted Answer

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

The formula for the point-biserial correlation coefficient was derived from the formula for the Pearson correlation coefficient.

The Spearman rank-order correlation coefficient is a measure of the direction and strength of the linear relationship between two ______ variables.

A researcher determines that $\chi$ ² = 3.56 to test for significance for a phi correlation coefficient.What was the decision for this phi correlation test?

Outliers can change the ______ of a correlation.

The coefficient of determination is mathematically equivalent to $\eta$ ².

Linearity is the assumption that the best way to describe a pattern of data is using a straight line.

A researcher observes a correlation of values from 2 to 10 points and draws conclusions about the full range of values in the population from 0 to 21 points.Which limitation for correctly interpreting a correlation coefficient did the researcher violate?

Which of the following is a limitation for interpreting a correlation?

The phi correlation coefficient is used to measure the correlation between two ordinal variables.

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?

Select the description below that identifies the following correlation: r = .28,p < .01.

Which of the following indicates the strongest correlation?

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.

To summarize correlations,we report the strength,the direction,and the p value for each correlation coefficient.

If r = .25,then the coefficient of determination is .06.

A researcher measures the correlation between the frequency of self-esteem (high,low)and health status (lean/healthy,overweight/obese).Based on the frequencies for each nominal category given below,what is the value of the phi correlation coefficient?

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

The correlation coefficient can be converted to a t statistic.

The coefficient of determination is a measure of significance.

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

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: Truehe Related-Samples T Test

Estimation and Confidence Intervals

Analysis of Variance: One-Way Between-Subjects Design

Analysis of Variance: One-Way Within-Subjects Repeated-Measuresdesign

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 formula for the point-biserial correlation coefficient was derived from the formula for the Pearson correlation coefficient.

The Spearman rank-order correlation coefficient is a measure of the direction and strength of the linear relationship between two ______ variables.

A researcher determines that χ\chiχ 2 = 3.56 to test for significance for a phi correlation coefficient.What was the decision for this phi correlation test?

Outliers can change the ______ of a correlation.

The coefficient of determination is mathematically equivalent to η\etaη 2.

Linearity is the assumption that the best way to describe a pattern of data is using a straight line.

A researcher observes a correlation of values from 2 to 10 points and draws conclusions about the full range of values in the population from 0 to 21 points.Which limitation for correctly interpreting a correlation coefficient did the researcher violate?

Which of the following is a limitation for interpreting a correlation?

The phi correlation coefficient is used to measure the correlation between two ordinal variables.

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?

Select the description below that identifies the following correlation: r = .28,p < .01.

Which of the following indicates the strongest correlation?

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.

To summarize correlations,we report the strength,the direction,and the p value for each correlation coefficient.

If r = .25,then the coefficient of determination is .06.

A researcher measures the correlation between the frequency of self-esteem (high,low)and health status (lean/healthy,overweight/obese).Based on the frequencies for each nominal category given below,what is the value of the phi correlation coefficient?

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

The correlation coefficient can be converted to a t statistic.

The coefficient of determination is a measure of significance.

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

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: Truehe Related-Samples T Test

Estimation and Confidence Intervals

Analysis of Variance: One-Way Between-Subjects Design

Analysis of Variance: One-Way Within-Subjects Repeated-Measuresdesign

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

A researcher determines that $\chi$ ² = 3.56 to test for significance for a phi correlation coefficient.What was the decision for this phi correlation test?

The coefficient of determination is mathematically equivalent to $\eta$ ².

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.