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The variance over the past 7 years, of the lengths (in inches) of a particular manufactured product has been 80.

The variance over the past 7 years, of the lengths (in inches) of a particular 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 15 such product lengths had a calculated sample standard deviation of 8 and mean of 9.4. Select the 95% confidence for the true variance of the product lengths. Use the appropriate table in the book.

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