Question: In a control chart application, we have found that the grand average over all past samples of size 6 is x-bar = 30 and R-bar

In a control chart application, we have found that the grand average over all past samples of size 6 is x-bar = 30 and R-bar = 5.
a. Set up x and R control charts for this application.
b. The following measurements are taken: 38, 35, 27, 30, 33, and 32. Is the process still in control?

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