(Solution) - Repeat Exercise 38 using a population standard deviation of -(2025 Original AI-Free Solution)

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Repeat Exercise 38, using a population standard deviation of ? = $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.