Let p equal the proportion of letters mailed in the Netherlands that are delivered the

Chapter 7, Problem 7.3-2

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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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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.

ANSWER:

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Given,

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