In a random sample of 60 refrigerators, the mean repair cost was $150. Assume the population standard deviation σ = $15.5. a. Find the Critical Value at 97% confidence level b. Find the margin of error E at 97% confidence level c. Construct a 97% confidence interval for the population mean repair cost d. Repeat exercise 3(c), using a population standard deviation of σ = $19.5 and same data info. Which confidence interval is wider?

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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3. In a random sample of 60 refrigerators, the mean repair cost was $150. Assume the population standard deviation σ = $15.5. a. Find the Critical Value at 97% confidence level b. Find the margin of error E at 97% confidence level c. Construct a 97% confidence interval for the population mean repair cost d. Repeat exercise 3(c), using a population standard deviation of σ = $19.5 and same data info. Which confidence interval is wider?
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