Solved: A random sample of 20 students yielded a mean of x
Chapter 1, Problem 9.72(choose chapter or problem)
A random sample of 20 students yielded a mean of \(\overline{x} = 72\) and a variance of \(s^2 = 16\) for scores on a college placement test in mathematics. Assuming the scores to be normally distributed, construct a 98% confidence interval for \(\sigma^2\).
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