Question: A simple random sample of size 20 is drawn from a population that is known to be normally distributed. The sample variance, (s^{2}), is determined

A simple random sample of size 20 is drawn from a population that is known to be normally distributed. The sample variance, \(s^{2}\), is determined to be 12.8 . Construct a \(90 \%\) confidence interval for \(\sigma^{2}\).

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