The Student Room Group

Is this a relationship or a difference?

A Psychologist was interested in why people sleep, and investigated the effects of extra exercise on the amount of sleep people have


He asked marathon runners to record the number of hours they slept on two different nights. One of the study nights was after running a race and the other was after a rest day.:confused:
Original post by Ikkjkhhgs
A Psychologist was interested in why people sleep, and investigated the effects of extra exercise on the amount of sleep people have


He asked marathon runners to record the number of hours they slept on two different nights. One of the study nights was after running a race and the other was after a rest day.:confused:


The Psychologist should have seen that exercise increases sleep, thus it is a relationship. However, it cant also be a difference, because there are variations... But I'd put a relationship as my answer.

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