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.


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  • CreatedNovember 06, 2015
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