What is the difference between the Cp and Cpk measures? Provide an example of a situation in which a process might perform well on one measure but poorly on the other
What will be an ideal response?
The process capability ratio, Cp, is the tolerance width of the process divided by the natural spread of the data generated by that process. The process capability index, Cpk, measures the potential for a process to generate defective outputs relative to either upper or lower specifications. A process that has a narrow spread but is off center (target) by either too high or too low could perform well when analyzed with the Cp measure but poorly using the Cpk measure.
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