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A pipes manufacturer makes pipes with a length that is supposed to be 13inches. A quality control technician sampled 21 pipes and found that the

A pipes manufacturer makes pipes with a length that is supposed to be 13inches. A quality control technician sampled

21 pipes and found that the sample mean length was 13.04 inches and the sample standard deviation was 0.12 inches. The technician claims that the mean pipe length is not 13 inches.

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