CPL 1 implies that the process mean is more than 3 standard deviations away from the lower specification limit.

Question

CPL >1 implies that the process mean is more than 3 standard deviations away from the lower specification limit.

Quizplus · Accepted Answer

This is true. CPL (Process Capability Lower) is calculated as (USL-mean)/3*standard deviation. If the value of CPL is greater than 1, it means that the upper specification limit (USL) is more than 3 standard deviations away from the mean. Thus, the lower specification limit (LSL) would also be more than 3 standard deviations away from the mean in the opposite direction. Hence, the process mean is more than 3 standard deviations away from the lower specification limit.

CPL >1 Implies That the Process Mean Is More Than