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A study randomly assigns 60 adults with high cholesterol to three groups: a new drug, an existing drug, or a placebo. None of the participants know which treatment they are receiving. This design includes all of the following EXCEPT:
A study randomly assigns 60 adults with high cholesterol to three groups: a new drug, an existing drug, or a placebo. None of the participants know which treatment they are receiving. This design includes all of the following EXCEPT: