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57 62 14 35 44 28 49 53 63 50 28 43 63 43 44 31 Construct a 95% confidence interval for the standard deviation

57 62 14 35 44 28 49 53

63 50 28 43 63 43 44 31

Construct a 95% confidence interval for the standard deviation in the growth of pine

trees per year, if a different sample of 20 trees had a standard deviation of 13cm/year.

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