# Question

A company manufacturing oil seals wants to establish control charts on the process. There are 25 preliminary samples of size 5 on the internal diameter of the seal. The summary data (in mm) are as follows: and x R

(a) Find the control limits that should be used on the x and R control charts.

(b) Assume that the 25 preliminary samples plot in control on both charts. Estimate the process mean and standard deviation.

(a) Find the control limits that should be used on the x and R control charts.

(b) Assume that the 25 preliminary samples plot in control on both charts. Estimate the process mean and standard deviation.

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