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Why Must an R Chart Be Constructed First Before an X-Bar

Question 114

Multiple Choice

Why must an R chart be constructed first before an X-bar chart preceded when monitoring a process mean?


A) to make sure that the upper control limit is not surpassed
B) to make sure that items in sub-groupings are random
C) to make sure that the sample sizes are equal
D) to make sure that the process is in control

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