14.29 Guess the correlation. Measurements in large samples show that the correlation
(a) between this semester’s GPA and the previous semester’s GPA of an upper-class student is about ________.
(b) between IQ and the scores on a test of the reading ability of seventh-grade students is about ________.
(c) between the number of hours a student spends studying per week and the average number of hours spent studying by his or her roommates is about ________.
The answers (in scrambled order) are
r = 0.2 r = 0.5 r = 0.8
Match the answers to the statements and explain your choice.