Which of these is not one of the primary techniques used to find out the process capability?

Which of these is not one of the primary techniques used to find out the process capability? Correct Answer Acceptance sampling

Histogram or probability plots, control charts and designed experiments are the 3 primary techniques used to find out process capability.

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The process capability of a machine is defined as the capability of the machine to
Which one of these is primary technique of the process capability analysis?