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A simple random sample from a population with a normal distribution of 9999 body temperatures has...

A simple random sample from a population with a normal distribution of 9999 body temperatures has x bar =98.40 F degrees

and s =0.68  F° . Construct an 80​% confidence interval estimate of the standard deviation of body temperature of all healthy humans.

( Can you tell me exactly how can find XL2   XR2. )

Math   Statistics-And-Probability   
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