A placebo effect occurs when
a. an experimenter finds what he or she expected to discover.
b. participants have not been randomly assigned to experimental and control conditions.
c. participants change their behavior because of their belief that a treatment has an effect.
d. both participants and experimental assistants are unaware of which participants get which treatment.
Answer: c. participants change their behavior because of their belief that a treatment has an effect.
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Which of the following is NOT true of infidelity in the U.S.?
a. Between 20 to 50 percent of women have engaged in extramarital sex. b. Between 30 to 60 percent of men have engaged in extramarital sex. c. 74 percent of men say they would have an affair if they knew they wouldn't get caught. d. 48 percent of men say they would have an affair if they knew they wouldn't get caught.
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a. fluid b. social c. perceptual d. naturalistic