Question: A process is monitored using an X chart UCL = 1 3 . 8 and LCL = 8 . 2 . The process standard deviation

A process is monitored using an X chart UCL=13.8 and LCL=8.2. The process standard deviation is
estimates to be 6.6. if the X chart is based on three-sigma limits,
a. What is the estimate of the process mean?
b. What is the size of each of the sampling subgroups?
(13, pg 682)

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