Question 8 What does the correlation coefficient r describe

Question 8

What does the correlation coefficient r describe?

Select one:

a. The strength and direction of the linear relationship between quantitative variables.

b. The strength and direction of the any relationship between any variables.

c. The percent of variability in the quantitative Y variable that can be explained by the quantitative X variable.

d. The slope of the regression line.

Question 9

True or False: There is a strong correlation between salary and occupation.

Select one:

a. True

b. False

Question 10

Read the following statements about correlation carefully. Three are true and one is false, which statements is FALSE?

Select one:

a. Because correlation has a unit of measurement, it is valid to say that the correlation between height (in inches) and arm span (in inches) is 0.73 inches.

b. If we switch the values of X and Y (switched the X and Y axes) the value of r would remain unchanged.

c. If we measure the X variable height (inches) against the Y variable weight (pounds) in different units (cm or kilograms), the value of r will still be the same.

d. The correlation coefficient r can be sensitive to outliers.

Solution

Answers:

8.a. The strength and direction of the linear relationship between quantitative variables.

9.True.

10. Because correlation has a unit of measurement, it is valid to say that the correlation between height (in inches) and arm span (in inches) is 0.73 inches. False

correlation has no unit of measurement