The professor swims. Professor Moore swims 2000 yards regularly in a vain attempt to undo middle age. Here are his times (in minutes) and his pulse rate (in beats per minute) after swimming for 23 sessions in the pool:

Time: 34.12 35.72 34.72 34.05 34.13 35.72 36.17 35.57 Pulse: 152 124 140 152 146 128 136 144 Time: 35.37 35.57 35.43 36.05 34.85 34.70 34.75 33.93 Pulse: 148 144 136 124 148 144 140 156 Time: 34.60 34.00 34.35 35.62 35.68 35.28 35.97 Pulse: 136 148 148 132 124 132 139

(a) Make a scatterplot. (Which is the explanatory variable?)

(b) Is the association between these variables positive or negative? Explain why you expect the relationship to have this direction.

(c) Describe the form and strength of the relationship.