Consider two processes.Process 1's mean is equal to its target (nominal)value,while the process 2's mean is not equal to its target value.The Cpkvalue for process 1 will _____,Cpkvalue for process 2.
A)Always be larger than
B)Always be the same as
C)Always be smaller than
D)Sometimes be larger than
E)Sometimes be smaller than

Question

Quizplus · Accepted Answer

Cpk is a measure of process capability, which is calculated by taking the minimum of the difference between the process mean and the specification limits, divided by three times the process standard deviation. Since process 1's mean is equal to its target (nominal) value, the difference between the mean and the specification limits is zero, resulting in a higher Cpk value. On the other hand, process 2's mean is not equal to its target value, which means that the difference between the mean and the specification limits is greater and the Cpk value will be smaller than process 1's Cpk value. Therefore, the Cpk value for process 1 will always be larger than process 2's Cpk value.

Consider Two Processes