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A Producer of Pharmaceutical Packaging Materials Monitors the Dimensions of One

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A producer of pharmaceutical packaging materials monitors the dimensions of one of its caps. The grand mean of the process (x double bar) is 1.25 cm. The average process range is .04 cm. The sample size used is 12 units per sample. Compute the upper and lower control limits for the X-bar chart.

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UCL = 1.25 + (.27 * ...

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