Question 1

The assumption that there is an equal variance or scatter of data points dispersed along the regression line is referred to as ______.

Accepted Answer

A)   normality
B)   linearity
C)   homoscedasticity
D)   restriction of rangeE) A) and D)
F) All of the above

Question 2

A correlation coefficient can ______ demonstrate cause.

Accepted Answer

A)   always
B)   never
C)   mostly
D)   intermittentlyE) A) and B)
F) B) and D)

Question 3

A statistical procedure used to describe the strength and direction of the linear relationship between two factors is called ______.

Accepted Answer

A)   effect size
B)   power
C)   a correlation
D)   coincidenceE) A) and B)
F) A) and C)

Question 4

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

Accepted Answer

A) True 
 B)False

Question 5

Three assumptions for a correlation are homoscedasticity,linearity,and normality.

Accepted Answer

A) True 
 B)False

Question 6

The formula for the phi correlation coefficient was derived from the formula for the Pearson correlation coefficient.

Accepted Answer

A) True 
 B)False

Question 7

Which of the following would not be reported for a correlation?

Accepted Answer

A)   the sample size
B)   the coefficient of determination
C)   the critical values for each test
D)   the strength and direction of the correlationE) C) and D)
F) B) and D)

Question 8

If r = 0.026 and df = 10,then t = 7.20.

Accepted Answer

A) True 
 B)False

Question 9

We convert r to a chi-square statistic for which of the following correlation tests?

Accepted Answer

A)   Pearson
B)   Spearman
C)   point-biserial
D)   phiE) A) and D)
F) A) and C)

Question 10

The correlation coefficient measures the extent to which changes in one factor are ______ in a second factor.

Accepted Answer

A)   related to changes
B)   causing changes
C)   causing variability
D)   all of theseE) A) and D)
F) C) and D)

Question 11

The correlation coefficient can be converted to a chi-square statistic.

Accepted Answer

A) True 
 B)False

Question 12

The correlation coefficient varies between 0 and 1 and can never be negative.

Accepted Answer

A) True 
 B)False

Question 13

The most common measure of effect size for the correlation coefficient is called ______.

Accepted Answer

A)   the correlation coefficient
B)   the coefficient of determination
C)   estimated Cohen's d
D)   the test statisticE) A) and B)
F) None of the above

Question 14

A researcher measures the correlation between self-esteem (high,low) and physical fitness scores among school athletes.In the study,12 participants reported high self-esteem and 12 reported low self-esteem.If sY = 9.06 and MY1 - MY2 = 11,then what is the value of the correlation coefficient?

Accepted Answer

A)   .61
B)   .30
C)   .39
D)   there is not enough information to answer this questionE) B) and C)
F) A) and D)

Question 15

The sign (+ or -)of a correlation coefficient indicates the direction of a relationship between two factors.

Accepted Answer

A) True 
 B)False

Question 16

If r = .65 and n = 36,then what is the value of  χ\chiχ 2?

Accepted Answer

A)   3.84
B)   5.99
C)   15.21
D)   23.40 E) None of the above
F) All of the above

Question 17

A researcher measures the following correlation between cost of produce and number of units sold.Which description best explains the relationship between these two factors?

Accepted Answer

A)   As the cost of produce increases, so does the number of units sold.
B)   Less expensive produce is associated with an increased number of units sold.
C)   Less expensive produce is associated with a decreased number of units sold.
D)   No linear pattern is evident.E) B) and C)
F) A) and D)

Question 18

The appropriate correlation coefficient for measuring the direction and strength of the linear relationship between two ranked or ordinal variables is ______.

Accepted Answer

A)   the Spearman correlation coefficient
B)   the point-biserial correlation coefficient
C)   the phi correlation coefficient
D)   none of theseE) All of the above
F) A) and B)

Question 19

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

Accepted Answer

A) True 
 B)False

Question 20

A researcher measures the following correlation: r = -.21.What is the value of the coefficient of determination?

Accepted Answer

A)   .04
B)   -.04
C)   .42
D)   -.42E) A) and D)
F) B) and C)

Exam 15: Correlation

The most common measure of effect size for the correlation coefficient is called ______.

Correct AnswerverifiedShow Answer

A researcher measures the correlation between self-esteem (high,low) and physical fitness scores among school athletes.In the study,12 participants reported high self-esteem and 12 reported low self-esteem.If sY = 9.06 and MY1 - MY2 = 11,then what is the value of the correlation coefficient?

Correct AnswerverifiedShow Answer

The correlation coefficient measures the extent to which changes in one factor are ______ in a second factor.

Correct AnswerverifiedShow Answer

A researcher measures the following correlation between cost of produce and number of units sold.Which description best explains the relationship between these two factors?

Correct AnswerverifiedShow Answer

If r = .65 and n = 36,then what is the value of χ\chiχ 2?

Correct AnswerverifiedShow Answer

Which of the following would not be reported for a correlation?

Correct AnswerverifiedShow Answer

The appropriate correlation coefficient for measuring the direction and strength of the linear relationship between two ranked or ordinal variables is ______.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The formula for the phi correlation coefficient was derived from the formula for the Pearson correlation coefficient.

Correct AnswerverifiedShow Answer

The sign (+ or -)of a correlation coefficient indicates the direction of a relationship between two factors.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A researcher measures the following correlation: r = -.21.What is the value of the coefficient of determination?

Correct AnswerverifiedShow Answer

Three assumptions for a correlation are homoscedasticity,linearity,and normality.

Correct AnswerverifiedShow Answer

We convert r to a chi-square statistic for which of the following correlation tests?

Correct AnswerverifiedShow Answer

The correlation coefficient varies between 0 and 1 and can never be negative.

Correct AnswerverifiedShow Answer

The assumption that there is an equal variance or scatter of data points dispersed along the regression line is referred to as ______.

Correct AnswerverifiedShow Answer

A correlation coefficient can ______ demonstrate cause.

Correct AnswerverifiedShow Answer

If r = 0.026 and df = 10,then t = 7.20.

Correct AnswerverifiedShow Answer

A statistical procedure used to describe the strength and direction of the linear relationship between two factors is called ______.

Correct AnswerverifiedShow Answer

The correlation coefficient can be converted to a chi-square statistic.

Correct AnswerverifiedShow Answer

Correct Answer
verified

A researcher measures the correlation between self-esteem (high,low) and physical fitness scores among school athletes.In the study,12 participants reported high self-esteem and 12 reported low self-esteem.If s_Y = 9.06 and M_Y1 - M_Y2 = 11,then what is the value of the correlation coefficient?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

If r = .65 and n = 36,then what is the value of $\chi$ ²?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified