Answered You can hire a professional tutor to get the answer.
QUESTION
The mean replacement time for a random sample of 20 washing machines is 9.4 years and the standard deviation is 2.6 years.
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.
