Question 1

What is the problem with the following data for computing a correlation?

Accepted Answer

A)   The correlation coefficient will equal 0 because it violates the assumption of normality.
B)   The correlation coefficient will equal 1.0 because it violates the assumption of normality.
C)   The correlation coefficient will equal 0 because it violates the assumption of linearity.
D)   The correlation coefficient will equal 1.0 because it violates the assumption of linearity.E) A) and C)
F) None of the above

Question 2

A positive correlation is always stronger than a negative correlation.

Accepted Answer

A) True 
 B)False

Question 3

A researcher measures the following correlation between number of years of education and life satisfaction: r = +.08.What is the value of the coefficient of determination?

Accepted Answer

A)   .08
B)   .16
C)   .01
D)   .11E) B) and D)
F) A) and B)

Question 4

Outliers can change both the direction and strength of a correlation coefficient.

Accepted Answer

A) True 
 B)False

Question 5

Correlation does not show causation.

Accepted Answer

A) True 
 B)False

Question 6

The coefficient of determination is ______.

Accepted Answer

A)   a measure of effect size
B)   mathematically equivalent to  η\etaη 2
C)   equal to the correlation coefficient squared
D)   all of these E) A) and C)
F) None of the above

Question 7

Restriction of range occurs when 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.

Accepted Answer

A) True 
 B)False

Question 8

A researcher measures the following correlation between cups of coffee consumed daily and daily work schedule.Which description best explains the relationship between these two factors?

Accepted Answer

A)   The more a person works, the more coffee he or she tends to drink.
B)   The less a person works, the more coffee he or she tends to drink.
C)   The more a person works, the less coffee he or she tends to drink.
D)   No linear pattern is evident.E) A) and D)
F) B) and D)

Question 9

When we compute many correlations in a single study,we report each correlation coefficient in a table called a correlation matrix.

Accepted Answer

A) True 
 B)False

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

The Spearman correlation coefficient is used to measure the correlation between two nominal variables.

Accepted Answer

A) True 
 B)False

Question 12

Which of the following is the assumption that the best way to describe the pattern of data is using a straight line?

Accepted Answer

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

Question 13

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

Accepted Answer

A) True 
 B)False

Question 14

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

Accepted Answer

A)   a less 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 outliersE) A) and C)
F) C) and D)

Question 15

A researcher measures the correlation between gender and student aptitude scores from 0 to 100 among 20 participants.If rpb = .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 questionD) All of the above
E) None of the above

Question 16

The normality assumption states that the population of X and Y scores form a bivariate ("two variable") normal distribution,such that ______.

Accepted Answer

A)   the population of X and Y scores are normally distributed
B)   for each X score, the distribution of Y scores is normally distributed
C)   for each Y score, the distribution of X scores is normally distributed
D)   all of theseE) A) and D)
F) All of the above

Question 17

The correlation coefficient is used to measure the ______ and ______ of the linear relationship between two factors.

Accepted Answer

A)   date, time
B)   mean, variance
C)   significance, effect size
D)   strength, directionE) A) and B)
F) A) and C)

Question 18

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 questionD) None of the above
E) All of the above

Question 19

The correlation coefficient ranges between ______ and ______.

Accepted Answer

A)   0, +1
B)   -1, 0
C)   -1, +1
D)   - ∞\infty∞ , + ∞\infty∞E) C) and D)
F) B) and C)

Question 20

A researcher computes the following phi correlation coefficient: r ϕ\phiϕ  = .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 D) A) and C)
E) A) and B)

Exam 15: Correlation

What is the problem with the following data for computing a correlation?

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

A researcher measures the following correlation between cups of coffee consumed daily and daily work schedule.Which description best explains the relationship between these two factors?

Correct AnswerverifiedShow Answer

The Spearman correlation coefficient is used to measure the correlation between two nominal variables.

Correct AnswerverifiedShow Answer

Correlation does not show causation.

Correct AnswerverifiedShow Answer

A researcher measures the correlation between gender and student aptitude scores from 0 to 100 among 20 participants.If rpb = .49,then what is the decision for this correlation test?

Correct AnswerverifiedShow Answer

A researcher computes the following phi correlation coefficient: r ϕ\phiϕ = .42.If the sample size was 20,then what is the decision for this correlation test?

Correct AnswerverifiedShow Answer

A positive correlation is always stronger than a negative correlation.

Correct AnswerverifiedShow Answer

Restriction of range occurs when 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.

Correct AnswerverifiedShow Answer

Outliers can change both the direction and strength of a correlation coefficient.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The coefficient of determination is ______.

Correct AnswerverifiedShow Answer

Which of the following is the assumption that the best way to describe the pattern of data is using a straight line?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A researcher measures the following correlation between number of years of education and life satisfaction: r = +.08.What is the value of the coefficient of determination?

Correct AnswerverifiedShow Answer

The correlation coefficient ranges between ______ and ______.

Correct AnswerverifiedShow Answer

When we compute many correlations in a single study,we report each correlation coefficient in a table called a correlation matrix.

Correct AnswerverifiedShow Answer

The correlation coefficient is used to measure the ______ and ______ of the linear relationship between two factors.

Correct AnswerverifiedShow Answer

The normality assumption states that the population of X and Y scores form a bivariate ("two variable") normal distribution,such that ______.

Correct AnswerverifiedShow Answer

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A researcher measures the correlation between gender and student aptitude scores from 0 to 100 among 20 participants.If r_pb = .49,then what is the decision for this correlation test?

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A researcher computes the following phi correlation coefficient: r_$\phi$ = .42.If the sample size was 20,then what is the decision for this correlation test?

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The correlation coefficient ranges between and .

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The correlation coefficient is used to measure the and of the linear relationship between two factors.

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