Which of the following is true regarding the process capability index Cpk?
A)A Cpk index value of 1 is ideal,meaning all units meet specifications.
B)The larger the Cpk,the more units meet specifications.
C)The Cpk index can only be used when the process centerline is also the specification centerline.
D)Positive values of the Cpk index are good;negative values are bad.
E)The smaller the Cpk,the more units meet specifications.

Question

Quizplus · Accepted Answer

The Cpk index measures the capability of a process to meet specifications, with a value of 1 indicating that all units meet specifications. The larger the Cpk value, the more units that meet specifications, as it indicates a higher level of process capability. A negative Cpk value indicates that the process is not capable of meeting specifications, while positive values indicate varying degrees of capability. The process centerline does not have to be the same as the specification centerline for the Cpk index to be used. Therefore, option B is the correct choice.

Which of the Following Is True Regarding the Process Capability