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If the sample size is 4, what will be the value of the upper control limit of the GCC R chart?

If the sample size is 4, what will be the value of the upper control limit of the GCC R chart? Correct Answer UCL=2.282R̅

We know that, for sample size= 4, the value of D4=2.282. So putting it into the equation of the UCL of R chart of the GCC gives, UCL=2.282R

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