# Control Limits

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A new machine has just been installed to cut and rough shape large slugs. The slugs are then transferred to a precision grinder. One of the critical measurements is the outside diameter. The quality control inspector randomly selected 5 slugs each hour, measured the outside diameter and recorded the results. The measurements in millimeters for the period 8:00 to 10:30. Show how you would :

Determine the control limits for the mean and range, and, how you would plot the control limits for the mean outside diameter and the range. Are there any points that are "out of control"? Comment.

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##### Solution Summary

A new machine has just been installed to cut and rough shape large slugs. The slugs are then transferred to a precision grinder. One of the critical measurements is the outside diameter. The quality control inspector randomly selected 5 slugs each hour, measured the outside diameter and recorded the results. The measurements in millimeters for the period 8:00 to 10:30. Show how you would :

Determine the control limits for the mean and range, and, how you would plot the control limits for the mean outside diameter and the range. Are there any points that are "out of control"? Comment.

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