Repeat Exercise 38, using a population standard deviation of = $19.50. Which confidence interval is wider?
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Repeat Exercise 38, using a population standard deviation of σ = $19.50. 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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Related Book For
Elementary Statistics Picturing The World
ISBN: 9780321911216
6th Edition
Authors: Ron Larson, Betsy Farber
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