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The mean replacement time for a random sample of 15 washing machine is 10.7 years and...

The mean replacement time for a random sample of 15 washing machine is 10.7 years and the standard deviation is 2.5 years. Construct 99% confidence interval for the standard deviation of the replacement of all washing machines of this type. What would be the value if the standard deviation is 2.7 years.

Math   Statistics-And-Probability   
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Answer #1

n = 15

s2 = 6.25

The critical values for α=0.01 and df = 14 are

Part b)

If the SD is 2.7, s2 = 7.29

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