21. Explain why a moving-average control chart with span size k must use different control limits for
Question:
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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Related Book For
Introduction To Probability And Statistics For Engineers And Scientists
ISBN: 9780125980579
3rd Edition
Authors: Sheldon M. Ross
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