Question: Twenty-five samples of size 5 are drawn from a process at one-hour intervals, and the following data are obtained: (a) Calculate trial control limits for

Twenty-five samples of size 5 are drawn from a process at one-hour intervals, and the following data are obtained:


25 25 25 Ση-8.60 Σ5-3.64 i=1 Σ362.75 i=1 i=1


(a) Calculate trial control limits for XÌ… and R charts.

(b) Repeat part (a) for XÌ… and S charts.

25 25 25 -8.60 5-3.64 i=1 362.75 i=1 i=1

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