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The mean replacement time for a random sample of 12 microwave ovens is 8.6 years...
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The mean replacement time for a random sample of 12 microwave ovens is 8.6 years with a standard deviation of 2.3 years. Construct the 98% confidence interval for the population variance. Assume the data are normally distributed. Let X20.01,11 = 24.72; X20.99,11 = 3.05.
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