In an experiment, some people receive an active drug while others receive a placebo. Neither the subjects nor the people administering the drug know which people got the drug and which got the placebo. This is an example of a(n) ______ procedure
a. single-blind
b. double-blind
c. alternative hypothesis
d. placebo
B
Psychology
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To be effective, punishment must be given
a. contingently. b. intermittently. c. after a warning. d. as negative reinforcement.
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LearnSmart QuestionsThe gradual changes that occur in all persons as they age is called ________ aging.
A. tertiary B. functional C. secondary D. primary
Psychology