Question: Assume that each sample is obtained by randomly selecting values from a population with a normal distribution. A sample consists of 75 TV sets purchased

Assume that each sample is obtained by randomly selecting values from a population with a normal distribution.
A sample consists of 75 TV sets purchased several years ago. The replacement times of those TV sets have a mean of 8.2 years and a standard deviation of 1.1 years (based on data from "Getting Things Fixed," Consumer Reports). Construct a 90% confidence interval for the standard deviation of replacement times for all TV sets from that era. Does the result apply to TV sets currently being sold?

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