A manager wishes to build a​ 3-sigma range chart for a process. The sample size is​ five, the mean of sample means is 40.75​, and the average range is 10.30. From Table​ S6.1, the appropriate value of D3 is​ 0, and D4 is 2.115. What are the UCL and​ LCL, respectively, for this range​ chart? A.8.37 and 0.00   B.71.65 and 9.85   C.12.42 and 8.19   D.21.78 and 0.00   E.51.05 and 30.45

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Statistical Process Control

The use of statistical methods to observe and manage a process to make sure that it operates at its full potential and thus produce a confirming product is called Statistical Process Control.