Working adults appear to sleep fewer hours per day. Researches have studied the

Question

Working adults appear to sleep fewer hours per day. Researches have studied the relationship between hours of sleep per day and calorie consumption in adults For every one hour increase in sleep claorie consumption decreases by 294 calories (r=0.82) Why is this statistic appropriate for this situation? 1) It infers a casual relationship between hours or sleep and calorie consumption. 2) it tests the difference between the hours of sleep and calorie consumption. 3) it measures the strength of the association between hours of sleep and claorie consumptions. 4) It determines the factors that impact both the hours of sleep and calorie consumption.

Explanation / Answer

The answer is not 1 because correlation does not imply causation. 2 and 4 are irrelevant. The correct answer is 3 because we are trying to measure how these variables are related.

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