Multiple control groups are only necessary when studying the effect of drugs on behavior.
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Q80: The performance of subjects in a control
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Q82: It is legitimate to infer the shape
Q83: Matching is effective even if there is
Q84: When a strong correlation exists between a
Q86: Matching is just as easy with multigroup
Q87: In within-subjects designs, subjects are exposed to
Q88: All other things being equal, the between-subjects
Q89: Error variance is eliminated in within-subjects designs.
Q90: The increased power of within-subjects designs may
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