# Question

A manufacturer of component for automobile transmissions wants to use control charts to monitor a process producing a shaft. The resulting data from 20 samples of 4 shaft diameters that have been measured are:

(a) Find the control limits that should be

(b) Assume that the 20 preliminary samples plot in control on both charts. Estimate the process mean and standard deviation.

(a) Find the control limits that should be

(b) Assume that the 20 preliminary samples plot in control on both charts. Estimate the process mean and standard deviation.

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