Question

Let p equal the proportion of letters mailed in the Netherlands that are delivered the next day. Suppose that y = 142 out of a random sample of n = 200 letters were delivered the day after they were mailed.
(a) Give a point estimate of p.
(b) Use Equation 7.3-2 to find an approximate 90% confidence interval for p.
(c) Use Equation 7.3-4 to find an approximate 90% confidence interval for p.
(d) Use Equation 7.3-5 to find an approximate 90% confidence interval for p.
(e) Find a one-sided 90% confidence interval for p that provides a lower bound for p.


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  • CreatedOctober 12, 2015
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