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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Oat Flakes Oat Flakes Oat Oat Oat Flakes Flakes Flakes Oat Flakes Oat Flakes Oat Oat Flakes Flakes 17 oz. 13 oz. 16 oz. 18 oz. 17 oz. 16 oz. 15 oz. 17 oz. 16 oz.