Question: 21. Explain why a moving-average control chart with span size k must use different control limits for the first k1 moving averages, whereas an exponentially

21. Explain why a moving-average control chart with span size k must use different control limits for the first k−1 moving averages, whereas an exponentially weighted moving-average control chart can use the same control limits throughout. [Hint:

Argue that Var(Mt ) decreases in t , whereas Var(Wt ) increases, and explain why this is relevant.]

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