Drug X is effective: it lowered blood pressure in 70 percent of the patients who took it.
Which one of the following, if true, most strengthens the argument?
Answer and explanation
Correct answer: C. Without treatment, only about 10 percent of similar patients see their blood pressure drop
- Step 1: The effect must be compared with what happens without the drug. Step 2. A low natural rate of improvement makes 70 percent impressive. Answer: only about 10 percent improve untreated. Why not the others: these do not compare with no treatment.
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