As part of a study of the psychobiological correlates of success in athletes, the following measurements

(courtesy of W. Morgan) are obtained from members of the U.S. Olympic wrestling team.

Anger x 6 7 5 21 13 5 13 14 Vigor y 28 23 29 22 20 19 28 19

(a) Plot the scatter diagram.

(b) Calculate r.

(c) Obtain the least squares line.

(d) Predict the vigor score y when the anger score is x
8.