Question 1

In a correlation matrix, the numbers above and below the diagonal row of 1.00s are a mirror image of themselves.

Accepted Answer

A) True 
 B)False

Question 2

Which of the following refers to a correlation between two variables?

Accepted Answer

A) bicorrelate 
B) bivariate 
C) two-way variance 
D) two-way analysis 
A) bicorrelate 
B) bivariate 
C) two-way variance 
D) two-way analysis

Question 3

What type of correlation exist if the less time you take to complete a test, the more items you will get wrong?

Accepted Answer

A) positive correlation 
B) negative correlation 
C) indirect correlation 
D) b & c 
A) positive correlation 
B) negative correlation 
C) indirect correlation 
D) b & c

Question 4

The Pearson correlation coefficient examines variables that are ______.

Accepted Answer

A) continuous in nature 
B) not continuous in nature 
C) categorical in nature 
D) not categorical in nature 
A) continuous in nature 
B) not continuous in nature 
C) categorical in nature 
D) not categorical in nature

Question 5

The coefficient of determination is the percentage of variance in one variable that _________.

Accepted Answer

A) is accounted for by the variance in the other variable 
B) matters only when the other variable is constant 
C) equals the square root of the Pearson product-moment correlation coefficient 
D) can be determined by taking the square root of the phi coefficient 
A) is accounted for by the variance in the other variable 
B) matters only when the other variable is constant 
C) equals the square root of the Pearson product-moment correlation coefficient 
D) can be determined by taking the square root of the phi coefficient

Question 6

This is a correlation that is best expressed as a straight line.

Accepted Answer

A) line correlation 
B) direct correlation 
C) strong correlation 
D) linear correlation 
A) line correlation 
B) direct correlation 
C) strong correlation 
D) linear correlation

Question 7

Which of the following is the weakest correlation?

Accepted Answer

A) -.24 
B) -.22 
C) .19 
D) -.96 
A) -.24 
B) -.22 
C) .19 
D) -.96

Question 8

If the coefficient of determination between two variables is .81, what is the Pearson correlation coefficient?

Accepted Answer

A) .19 
B) .34 
C) .66 
D) .90 
A) .19 
B) .34 
C) .66 
D) .90

Question 9

A negative correlation indicates that variables change in opposite directions.

Accepted Answer

A) True 
 B)False

Question 10

You can use Pearson's correlation coefficient if one or more of your variables are ordinal or nominal.

Accepted Answer

A) True 
 B)False

Question 11

If X increases in value as Y increases, what type of correlation exists?

Accepted Answer

A) positive correlation 
B) negative correlation 
C) no correlation 
D) inverse correlation 
A) positive correlation 
B) negative correlation 
C) no correlation 
D) inverse correlation

Question 12

This measure is equal to the percentage of variance in one variable that is accounted for by the variance in a second variable.

Accepted Answer

A) correlation coefficient 
B) Pearson's product-moment correlation coefficient 
C) coefficient of determination 
D) coefficient of alienation 
A) correlation coefficient 
B) Pearson's product-moment correlation coefficient 
C) coefficient of determination 
D) coefficient of alienation

Question 13

Who is responsible for the invention of the Pearson product-moment correlation coefficient?

Accepted Answer

A) Pearson Fisher 
B) Karl Pearson 
C) Karl Fisher 
D) Fisher Pearson 
A) Pearson Fisher 
B) Karl Pearson 
C) Karl Fisher 
D) Fisher Pearson

Question 14

"The better your time management skills are, the more work you are able to do" is an example of a _______.

Accepted Answer

A) continuous correlation 
B) biserial correlation 
C) positive correlation 
D) negative correlation 
A) continuous correlation 
B) biserial correlation 
C) positive correlation 
D) negative correlation

Question 15

If you wanted to compute the correlation between two ordinal-level variables, which type of correlation should you use?

Accepted Answer

A) point biserial 
B) phi 
C) Spearman rank 
D) Pearson 
A) point biserial 
B) phi 
C) Spearman rank 
D) Pearson

Question 16

Which of the following correlations would be interpreted as a very strong relationship?

Accepted Answer

A) .80 
B) .70 
C) .60 
D) .50 
A) .80 
B) .70 
C) .60 
D) .50

Question 17

This is another word for a positive correlation.

Accepted Answer

A) inverse correlation 
B) negative correlation 
C) strong correlation 
D) direct correlation 
A) inverse correlation 
B) negative correlation 
C) strong correlation 
D) direct correlation

Question 18

Which of the following correlations would be interpreted as a weak relationship?

Accepted Answer

A) -.26 
B) -.46 
C) -.66 
D) -.86 
A) -.26 
B) -.46 
C) -.66 
D) -.86

Question 19

It is better to find a positive correlation as opposed to a negative correlation.

Accepted Answer

A) True 
 B)False

Question 20

A correlation coefficient comparing exercise and body mass is -.67.What does this say about the relationship between exercise and weight?

Accepted Answer

If exercise / body mass = -.67

Exam 5: Ice Cream and Crime: Computing Correlation Coefficients

In a correlation matrix, the numbers above and below the diagonal row of 1.00s are a mirror image of themselves.

Which of the following refers to a correlation between two variables?

What type of correlation exist if the less time you take to complete a test, the more items you will get wrong?

The Pearson correlation coefficient examines variables that are ______.

The coefficient of determination is the percentage of variance in one variable that _________.

This is a correlation that is best expressed as a straight line.

Which of the following is the weakest correlation?

If the coefficient of determination between two variables is .81, what is the Pearson correlation coefficient?

A negative correlation indicates that variables change in opposite directions.

You can use Pearson's correlation coefficient if one or more of your variables are ordinal or nominal.

If X increases in value as Y increases, what type of correlation exists?

This measure is equal to the percentage of variance in one variable that is accounted for by the variance in a second variable.

Who is responsible for the invention of the Pearson product-moment correlation coefficient?

"The better your time management skills are, the more work you are able to do" is an example of a _______.

If you wanted to compute the correlation between two ordinal-level variables, which type of correlation should you use?

Which of the following correlations would be interpreted as a very strong relationship?

This is another word for a positive correlation.

Which of the following correlations would be interpreted as a weak relationship?

It is better to find a positive correlation as opposed to a negative correlation.

A correlation coefficient comparing exercise and body mass is -.67.What does this say about the relationship between exercise and weight?

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