SOLUTION: In a survey of 3005 adults, it was found that 81% used at least one prescription medication. Construct a 90% confidence interval estimate of the percentage of adults who use at lea

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Question 1056932: In a survey of 3005 adults, it was found that 81% used at least one prescription medication. Construct a 90% confidence interval estimate of the percentage of adults who use at least one prescription medication.

Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
the interval is z* sqrt (p*(1-p)/n)=1.645* sqrt{(.81)(.19)/3005}=0.0118; 1.645 is z(.95)
the CI is (0.7982,0.8218) or (79.8%,82.2%)