One hundred psychiatric patients were randomly assigned to one of two groups. Group 1 received a new drug in pill form. Group 2 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. What could be a potential confound in this study?
A) Having some seriously ill and some moderately ill patients in both groups
B) Having all patients come from the same clinic
C) Having the drug group be inpatients and the placebo group be outpatients
D) Not previously testing the drug on primates
Correct Answer:
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