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Statistical process control applied to a ceramic line works by

  • A.inspecting every single finished piece for any visible faults at all
  • B.testing a random sample of the product to destruction weekly
  • C.recording only the total number of rejects at the end of each day
  • D.monitoring measured variables to detect drift before defects appear

Answer: D

Charting a variable such as green density or slop specific gravity shows a trend developing while the product is still acceptable. Waiting for rejects to appear means the process has already been out of control for some time.

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