Kaylee wants to test her hypothesis that she performs better on tests after getting more sleep.In which way will she best be able to do this?

To test her own hypothesis, Kaylee should compare her test performance under different amounts of sleep. She can analyze her average test scores after nights when she slept for different amounts of time and see whether more sleep is associated with better scores. Choice C describes that comparison; keeping sleep the same, as in A, would not test how changing sleep affects her scores.

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