Question: Control charts for XÌ and R are to be set up for an important quality characteristic. The sample size is n = 5, and xÌ

Control charts for XÌ… and R are to be set up for an important quality characteristic. The sample size is n = 5, and xÌ… and r are computed for each of 35 preliminary samples. The summary data are
(a) Calculate trial control limits for XÌ… and R charts.

(b) Assuming that the process is in control, estimate the process mean and standard deviation.

35 35 -1200 -7805 i=1 i=1 i=1

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