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The postmaster of a small western town receives a certain number of complaints each day about mail delivery. Determine three-sigma (Z=3) control limits using the

The postmaster of a small western town receives a certain number of complaints each day about mail delivery. Determine three-sigma (Z=3) control limits using the following data. Is the process in control? Day 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Comp. 4 10 14 8 9 6 5 12 13 7 6 4 2 10 .

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