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A researcher conducts a study to evaluate the effectiveness of a new memory-enhancing supplement. They administer the supplement to a group of 40 college students. After two weeks of daily use, the students' scores on a memory recall test significantly improve compared to their baseline scores before starting the supplement. The researcher concludes that the supplement is an effective cognitive enhancer. A methodological evaluation of this study reveals that without a(n) ______ group, it is impossible to determine whether the improvement was caused by the supplement or by practice effects from taking the memory test a second time.

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Updated 2026-06-23

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Research Methods in Psychology - 4th American Edition @ KPU

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