4th Edition

ISBN: 9780073401331

Author: William Navidi Prof.

Publisher: McGraw-Hill Education

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Chapter 5.2, Problem 5E

The article “The Functional Outcomes of Total Knee Arthroplasty” (R. Kane, K. Saleh, et al., Journal of Bone and Joint Surgery, 2005:1719–1724) reports that out of 10,501 surgeries, 859 resulted in complications within six months of surgery.

a. Find a 95% confidence interval for the proportion of surgeries that result in complications within six months.
b. Find a 99% confidence interval for the proportion of surgeries that result in complications within six months.
c. A surgeon claims that the rate of complications is less than 8.5%. With what level of confidence can this claim be made?

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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Chapter 5.2, Problem 4E

Chapter 5.2, Problem 6E

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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 surgeries that result in complications within six months using the MINITAB software.

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