Question: A plot below the lower control limit on the range chart: 1. Should be ignored since lower variation is desirable II. May be an indication

A plot below the lower control limit on the range
A plot below the lower control limit on the range chart: 1. Should be ignored since lower variation is desirable II. May be an indication that process variation has decreased III. Should be investigated for assignable causes O1, II, and III II and III I and III II only I and

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