Repeat Exercise 38, changing the sample size to n = 40. Which confidence interval is wider? Explain.
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Repeat Exercise 38, changing the sample size to n = 40. Which confidence interval is wider? Explain.
Exercise 38
In a random sample of 60 refrigerators, the mean repair cost was $150.00. Assume the population standard deviation is $15.50. Construct a 99% confidence interval for the population mean repair cost. Interpret the results.
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Elementary Statistics Picturing The World
ISBN: 9780321911216
6th Edition
Authors: Ron Larson, Betsy Farber
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