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