Question: Which statement about MR (moving range) control chart is INCORRECT? Select one: a. It performs as effectively as R chart b. It is used only

Which statement about MR (moving range) control chart is INCORRECT?

Select one: a. It performs as effectively as R chart b. It is used only when the actual sample size is one c. The span (or window size) is used as the sample size in computing the MR values d. It is often used together with Individual Control Chart e. None of the above

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