[All Steps] A quality control engineer is interested in the mean length of sheet insulation being cut automatically by machine. The desired length of the
Question: A quality control engineer is interested in the mean length of sheet insulation being cut automatically by machine. The desired length of the insulation is 12 ft. It is known that the standard deviation in the cutting length is 0.15 ft. A sample of 70 ft sheets yields a mean length of 12.14 ft. Find the 99% confidence interval for the mean length cut by machine.
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