The weights of boxes of Oat Flakes within a large production lot are sampled each hour. Managers

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The weights of boxes of Oat Flakes within a large production lot are sampled each hour. Managers want to set control limits that include 99.73% of the sample means.

APPROACH c Randomly select and weigh nine (n = 9) boxes each hour. Then find the overall mean and use Equations (S6-3) and (S6-4) to compute the control limits. Here are the nine boxes chosen for Hour 1:

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