The lower and upper specification limits for a component are 4.20 and 4.30 ounces, respectively. The process standard deviation is .02, and the process average is 4.24 ounces. Which one of the following statements is TRUE? A) The C_p index indicates the process is centered. B) The C_p index indicates the process is not centered. C) The C_pk index indicates the process is centered. D) The C_pk index indicates the process is not centered.

Question

Quizplus · Accepted Answer

The C_pk index is used for process capability when the process is not centered. Since the process average falls outside the specification limits (4.24 is less than the midpoint of 4.25), the process is not centered. Therefore, the correct index to use is the C_pk index, and the statement in option D is true.

The Lower and Upper Specification Limits for a Component Are