Statistics for Engineers and Scientists

4th Edition

ISBN: 9780073401331

Author: William Navidi Prof.

Publisher: McGraw-Hill Education

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Textbook Question

Chapter 5.2, Problem 12E

In a random sample of 150 customers of a high-speed internet provider, 63 said that their service had been interrupted one or more times in the past month.

a. Find a 95% confidence interval for the proportion of customers whose service was interrupted one or more times in the past month.
b. Find a 99% confidence interval for the proportion of customers whose service was interrupted one or more times in the past month.
c. Find the sample size needed for a 95% confidence interval to specify the proportion to within ±0.05.
d. Find the sample size needed for a 99% confidence interval to specify the proportion to within ±0.05.

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Chapter 5.2, Problem 11E

Chapter 5.2, Problem 13E

Chapter 5 Solutions

Statistics for Engineers and Scientists

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Solution Summary: The author calculates the 95% confidence interval for the proportion of customers whose services were interrupted one or more times in the past month.

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