In a double-blind experimental procedure
A. both the participant and experimenter know whether the participant received a drug or a placebo.
B. the participant, but not the experimenter, knows whether he/she received a drug or a placebo.
C. the experimenter, but not the participant, knows whether the participant received a drug or a placebo.
D. neither the participant nor the experimenter knows whether the participant received a drug or a placebo.
Answer: D
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Research on people's willingness to help individuals with AIDS indicates that we tend to be more likely to offer assistance
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