Question: I need help solving the following question: A machine is intended to cut wood sheets to a length of 12 feet. To test the machine's

I need help solving the following question:

A machine is intended to cut wood sheets to a length of 12 feet. To test the machine's accuracy, a sample of 41 cut sheets yields a mean length of 12.08 ft. The standard deviation of the sample if .15. Thus, we can calculate that the 99% confidence interval for the population average length is 12.08 +or- _______?

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