Determine two-sigma control limits using the data


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Q: The postmaster of a small western town receives a certain number of complaints each day about mail delivery.

Day                        1 2 3 4 5 6 7 8 9 10 11 12 13 14
Number of complaints 4 10 16 8 9 6 5 14 13 7 6 4 2 10

a. Determine two-sigma control limits using the above data.

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Operation Management: Determine two-sigma control limits using the data
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