29. What is the value of SP for the data set below?

X 1, 2, 9

Y 4, 4, 1

a. SP = 5

b. SP = -5

c. SP = 15

d. SP = -15

30. Which of the following best describes the Pearson correlation for these data?

X 2, 5, 3, 4

Y 5, 1, 4, 2

a. Positive

b. Negative

c. Zero

d. Curvilinear

31. A set of n = 15 pairs of scores (X and Y values) has SS_X = 4, SS_Y = 25, and SP = 6. What is the Pearson correlation (r) for these data?

a. r = 0.06

b. r = 0.60

c. r = 0.10

d. r = 0.16

32. Suppose the correlation between height and weight for adults is r = -0.60. Which proportion (or percent) of the variability in weight can be explained by its relationship with height?

a. 36%

b. 60%

c. 12%

d. 48%

33. A set of n = 15 pairs of scores (X and Y values) produces a correlation of r = 0.40. If each of the X values are multiplied by 2 and the correlation is computed for the new scores, which value will be obtained for the new correlation?

a. r = 0.80

b. r = 0.40

c. r = 0.20

d. r = 0.16

34. A researcher obtains a Pearson correlation of r = 0.60 for a sample of n = 6 pairs of X and Y scores. If the researcher tests the significance of the correlation, which value will be obtained for the t statistic?

a. t = 0.60

b. t = 0.77

c. t = 1.50

d. t = 3.75