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When the standard deviation is not known, mean control chart upper and lower control limits are computed by adding and subtracting ______ from the grand mean
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When the standard deviation is not known, mean control chart upper and lower control limits are computed by adding and subtracting ______ from the grand mean

User Protheus
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1 Answer

6 votes

Answer:

A2 x average range

Explanation:

User Megashigger
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