SOLUTION: A recent survey showed that among 775 randomly selected subjects who completed 4 years of college, 162 smoke and 613 do not smoke. Determine a 95% confidence interval for the true

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Question 1197598: A recent survey showed that among 775 randomly selected subjects who completed 4 years of college, 162 smoke and 613 do not smoke. Determine a 95% confidence interval for the true proportion of the given population that smokes.
95% CI: to
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!

Hi 
  p(smoke) = 162/775 = .209
95% CI   ⇒   z = 1.96   |  2-sided  Invnorm( .95 + .05/2) = Invnorm(.975)
ME = z%2Asqrt%28%28p%281-p%29%29%2Fn%29
ME = 1.96%2Asqrt%28%28.209%28.791%29%29%2F775%29
.209 - ME < mu < .209 + ME
Will let You finish it Up
Wish You the Best in your Studies.