30. In a research, if members of the control group are aware that they are being compared to the experimental group and behave
differently than they typically would to compensate for their perceived disadvantage, what kind of effect occurs?
(A) John Henry Effect.
(B) Hawthorne Effect.
(C) Placebo Effect.
(D) Experimenter Effect.
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在一項研究中，如果對照組的成員意識到他們...
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(A) John Henry Effec...
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