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) The smaller the C_pk, the more units meet specifications.

Question

Quizplus · Accepted Answer

The process capability index C_pk measures how well the process meets the specifications. A larger value indicates that more units meet specifications, while a smaller value indicates that fewer units meet specifications. Option A is incorrect because a C_pk value of 1 indicates that the process is meeting the specifications exactly and does not necessarily mean that all units are meeting the specifications. Option C is incorrect because the C_pk can be used regardless of the relationship between the process centerline and the specification centerline. Option D is incorrect because positive and negative values of the C_pk index have different interpretations depending on whether the process is centered on the target specification or not. Option E is also incorrect because a smaller value of the C_pk index means that fewer units meet the specifications.

Which of the Following Is True Regarding the Process Capability