Question: Samples of size n = 6 are collected from a process every hour. After 20 samples have been collected, we calculate x = 20.0 and

Samples of size n = 6 are collected from a process every hour. After 20 samples have been collected, we calculate x̅̅ = 20.0 and r̅ / d2 = 1.4.

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

(b) If s̅ / c4 = 1.5, calculate trial control limits for X̅ and S charts.

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