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In survey of 3005 randomly selected adults aged 57 through 85 years old, it was found that 2455 used at least one prescribed medication. a)

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In survey of 3005 randomly selected adults aged 57 through 85 years old, it was found that 2455 used at least one prescribed medication. a) Find the sample proportion p-hat as a percentage to 1 decimal place. b) Find the 90% confidence interval that estimates the percentage of adults aged 57 through 85 who use at least one prescribed medication. Answer as percentages to 1 decimal place. to

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