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A researcher wants to investigate the impact of aerobic exercise on life satisfaction. The researcher decides to define aerobic exercise as 90 minutes a week of light jogging and defines life satisfaction as the raw score on a self-reported survey.

The researcher's decision to define these two variables highlights the importance of what?

A

Independent and dependent variables.

B

Random selection of participants.

C

Experimental and control conditions.

D

Operational definitions.

E

Confounding variables.

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