2nd Edition

ISBN: 9781259570643

Author: Navidi

Publisher: MCG

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Textbook Question

Chapter 7.3, Problem 26E

Contaminated water: In a sample of 42 water specimens taken from a construction site, 26 contained detectable levels of lead.

a. Construct a 90% confidence interval for the proportion of water specimens that contain detectable levels of lead.

b. Construct a 95% confidence interval for the proportion of water specimens that contain detectable levels of lead.

c. What is the effect of increasing the level of confidence on the width of the interval?

Source: Journal of Environmental Engineering 128:237–245

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Chapter 7.3, Problem 25E

Chapter 7.3, Problem 27E

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Solution Summary: The author explains how to construct a 90% confidence interval for the proportion of water specimens that contain detectable levels of lead.

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