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The mean replacement time for a random sample of 20 washing machines is 9 4 years andthe standard deviation is 2 6 years Construct a 99% confidence interval for the standarddeviation

The mean replacement time for a random sample of 20 washing machines is 9.4 years andthe standard deviation is 2.6 years. Construct a 99% confidence interval for the standarddeviation, σ, of the replacement times of all washing machines of this type.

 

Apr 21 2020 View more View Less

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