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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

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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3 votes
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

asked
User Protheus
by
7.8k points

1 Answer

6 votes

Answer:

A2 x average range

Explanation:

answered
User Megashigger
by
8.0k points
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