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.


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  • CreatedNovember 06, 2015
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