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In a survey of 3489 adults aged 57 through 85 years, it was found that 81.9% of them used at least one prescription medication. a.

In a survey of 3489 adults aged 57 through 85 years, it was found that 81.9% of them used at least one prescription medication. a. How many of the 3489 subjects used at least one prescription medication? answer: 2857 b. Construct a 90% confidence interval estimate of the percentage of adults aged 57 through 85 years who use at least one prescription medication _____%

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