# Question

Thirty samples each of size 7 have been collected to establish control over a process. The following data were collected:

(a) Calculate trial control limits for the two charts.

(b) On the assumption that the R chart is in control, estimate the process standard deviation.

(c) Suppose an s chart were desired. What would be the appropriate control limits and center line?

(a) Calculate trial control limits for the two charts.

(b) On the assumption that the R chart is in control, estimate the process standard deviation.

(c) Suppose an s chart were desired. What would be the appropriate control limits and center line?

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