SOLUTION: In a Gallup-type poll, 1080 randomly selected adults were surveyed and 28% of them said that they used the Internet for shopping at least a few timesa year. Construct a 99% confide

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Question 1177252: In a Gallup-type poll, 1080 randomly selected adults were surveyed and 28% of them said that they used the Internet for shopping at least a few timesa year. Construct a 99% confidence interval for the true proportion of adults who shop on the Internet at least a few times a year.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!

Hi
ME = z%2Asqrt%28%28p%281-p%29%29%2Fn%29
z = 2.576

ME = 2.576%2Asqrt%28%28.28%28.72%29%29%2F1080%29 = .035


.28 - .035 < mu < .28 + .035

CI: (.245, .315)

Wish You the Best in your Studies.