SOLUTION: In a survey of 3,050 adults aged 57 to 85 years, it was found that 83.5% of them used at least one prescription medication. Construct a 90% confidence interval estimate of p, the p
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Question 1192655: In a survey of 3,050 adults aged 57 to 85 years, it was found that 83.5% of them used at least one prescription medication. Construct a 90% confidence interval estimate of p, the percentage of all adults aged 57 to 85 years who use at least one prescription medication. (Enter your answers as percentages rounded to one decimal place; add a trailing zero as needed.) Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! 90% half-interval is z(0.95)*sqrt(p*(1-p)/n)
=1.645*sqrt(0.835*0.165/3050)
=0.0111
or 1.1%
(82.4%, 84.6%)
