The phase of a clinical trial that typically uses a full experimental design is which of the following?
A) Phase I
B) Phase II
C) Phase III
D) Phase IV
C
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Clinical trials, which are studies designed to assess the effectiveness of clinical interventions, often involve a series of phases. Phase I is designed to finalize features of the intervention. Phase II involves seeking preliminary evidence of efficacy and opportunities for refinements. Phase III is a full experimental test of treatment efficacy. In Phase IV, the researcher focuses primarily on generalized effectiveness and evidence about costs and benefits.
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