a. To determine Find the 95% confidence interval for the true repair cost. Explanation Calculation: The given information is that the mean repair cost 21 warranty repairs selected from a population of 126 was $45.664 with a standard deviation of $27.793. Software procedure: Step-by-step procedure to obtain the confidence interval using MINITAB software is given below: • Choose Stat > Basic statistics > 1-Sample t . • In Summarized data, enter the sample size as 21 and sample mean as 45.664. • In Standard deviation , enter a value 27.793 . • Check Options , enter Confidence level as 95 ... b. To determine Find the sample size required for a 95% confidence and an error of ± $ 5 . c. To determine Find the 95% confidence interval for true standard deviation.

Applied Statistics in Business and Economics

5th Edition

ISBN: 9780077837303

Author: David Doane, Lori Seward Senior Instructor of Operations Management

Publisher: McGraw-Hill Education

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Chapter 8, Problem 69CE

To determine

Find the 95% confidence interval for the true repair cost.

To determine

Find the sample size required for a 95% confidence and an error of ±$5.

To determine

Find the 95% confidence interval for true standard deviation.

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Chapter 8, Problem 68CE

Chapter 8, Problem 70CE

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Chapter 8 Solutions

Applied Statistics in Business and Economics

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