Question: Having a control group in the stress-reduction study would help to reveal the confound of history because if this confound were present, we would expect

Having a control group in the stress-reduction study would help to reveal the confound of history because if this confound were present, we would expect the control group to also increase in stress level, possibly more so than the experimental group. Having a control group informs a researcher about the effects of treatment versus no treatment and about the effects of historical events.

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