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

A plot below the lower control limit on the range chart:

I Should be ignored since lower variation is desirable II May be an indication that process variation has decreased from expected standard deviation III Should be investigated for assignable causes

Question 10 options:

	I and III
	II only
	I and II
	II and III
	I, II and III

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