One hundred psychiatric patients were randomly assigned to one of two groups. One group received a new drug in pill form. The other group was given identical-looking placebo pills. A panel of psychiatrists, who did not know which pill each participant received, evaluated all participants for level of agitation. In this study, how was experimenter bias reduced?
A) by having experienced psychiatrists evaluate agitation
B) by having researchers who don't know who got which pill
C) by adding another placebo condition
D) by adding a therapy group
Correct Answer:
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A
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