SOLUTION: If n = 500 and p^(p-hat) = 0.8, construct a 90% confidence interval

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Question 1187312: If n = 500 and p^(p-hat) = 0.8, construct a 90% confidence interval
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
the 90% half-interval is z(0.95)*sqrt(p(1-p)/n); p=0.8,1-p=0.2, n=500.
=1.645*sqrt(.16/500)
=0.0294
add to and subtract that from phat
(0.7706, 0.8294)