Ages of Presidents, use the ages (years) of the presidents at the times of their inaugurations. Treating the data as a sample, construct a 90% confidence interval estimate of the standard deviation of...

Ages of Presidents, use the ages (years) of the presidents at the times of their inaugurations. Treating the data as a sample, construct a 90% confidence interval estimate of the standard deviation of the population of all such ages.  S=6.5613    n=41.   Find confidence interval. Assume that each sample is a simple random sample obtained from  a population with a normal distribution.

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