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Dr. Nancy wants to understand the effect of exercise on self-reported levels of depression. She assigns participants to either a group that exercises 30 minutes each day or a group that does not exercise at all. She then records the depression level of her participants after a period of time. In this example, exercise would be the and level of depression would be the .
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Dr. Nancy wants to understand the effect of exercise on self-reported levels of depression. She assi...
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