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Statistics - Confidence Interval

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A. Let p equal the proportion of letters mailed in the Netherlands that are delivered the next day. If y= 142 out of a random sample of n=200 letters were delivered the day after they were mailed, find an approximate 95% confidence interval for p.

B. Let p equal the proportion of Americans who favor the death penalty. If a random sample of n= 1234 Americans yielded y=864 who favored the death penalty, find an approximate 95% confidence interval for p.

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(A) p = 142/200 = 0.71, q = 1 - p = 0.29, n = 200

Standard Error, SE = sqrt(pq/n) = sqrt(0.71 * 0.29/200) = 0.0321

Margin of ...

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