Having a control group in the stress-reduction study would help to reveal the confound of history because
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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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Related Book For 
Research Methods And Statistics A Critical Thinking Approach
ISBN: 9780495510017
3rd Edition
Authors: Sherri L. Jackson
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