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# A candy manufacturer selects mints at random from the

ISBN: 9780321923271 41

## Solution for problem 10E Chapter 7.3

Probability and Statistical Inference | 9th Edition

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Problem 10E

PROBLEM 10E

A candy manufacturer selects mints at random from the production line and weighs them. For one week, the day shift weighed n1 = 194 mints and the night shift weighed n2 = 162 mints. The numbers of these mints that weighed at most 21 grams was y1 = 28 for the day shift and y2 = 11 for the night shift. Let p1 and p2 denote the proportions of mints that weigh at most 21 grams for the day and night shifts, respectively.

(a) Give a point estimate of p1.

(b) Give the endpoints for a 95% confidence interval for p1.

(c) Give a point estimate of p1 − p2.

(d) Find a one-sided 95% confidence interval that gives a lower bound for p1 − p2.

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