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Which of these values of λ gives the weights given to current and previous observations matching as closely as possible the weights when these observations give by a Shewhart chart with the WE rules?

Which of these values of λ gives the weights given to current and previous observations matching as closely as possible the weights when these observations give by a Shewhart chart with the WE rules? Correct Answer 0.4

The value of λ is recommended by Hunter to be equal to 0.4 to get the weights given to current and previous observations, matching closely to the weights when these observations give by a Shewhart chart, with Western Electric rules.

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