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The variance, over the past seven years, of the lengths (in inches) of a specific manufactured product has been 80. However, recent changes have given rise to the suspicion that this may no longer be the case. A recent sample of 20 such product lengths had a calculated sample standard deviation of 8 and mean of 9.8. Find the 95% confidence interval for the true variance of the product lengths.

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Category:- Statistics and Probability
Reference No.:- M91144198

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