Eight college students recorded how many hours they exercised every week. Then they measured their pulse (heartbeats per minute) while they were resting.
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 What relationship does the graph show?
 1.) A positive relationship: The more you exercise, the higher your resting pulse.
 2.) A negative relationship: The more you exercise, the lower your resting pulse.
 3.) There is no relationship: Exercise has no effect on your resting pulse.