Discussion
Assertion (A): Charting a process variable is more useful than counting rejects.
Reason (R): A drift can be detected and corrected before it produces any defective product at all.
Answer: A
Both are true and the reason gives the advantage: reject counts are a lagging measure that tells you about material already made, whereas a control chart gives warning while the output is still good. Control charts are a preventive tool rather than a record of failure.
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