To select the best option that what is the purpose of keeping the diagnosing physicians unaware of the treatment status of the experimental subjects was to.
Answer to Problem 97E
Option (c) is the correct option
Explanation of Solution
In the question, a double-blind experiment was conducted to evaluate the effectiveness of the Salk polio vaccine. Thus, the purpose of keeping the diagnosing physicians unaware of the treatment status of the experimental subjects was to that a doctor who knows what drug is administered and its effects may assume its effects will be greater than a placebo, and this may be reflected in his recording of data. Thus, the option (c) is the correct option that is to eliminate a possible source of bias.
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