Which of the following is true regarding the process capability index C_pk? A) A C_pk index value of 1 is ideal, meaning all units meet specifications. B) The larger the C_pk, the more units meet specifications. C) The C_pk index can only be used when the process centerline is also the specification centerline. D) Positive values of the C_pk index are good; negative values are bad. E) None of the above is true.

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Quizplus · Accepted Answer

The larger the C_pk index, the more units meet specifications. A value of 1 is not necessarily ideal as it only means that the process is capable of meeting specifications, but does not guarantee that all units actually do. The C_pk index can be used even when the process centerline is not the specification centerline. There is no indication that positive vs negative values are good or bad.

Which of the Following Is True Regarding the Process Capability