The process capability measures Cp and Cpk differ because
A)only one ensures the process mean is centered within the limits.
B)Cp values above 1 indicate a capable process,Cpk values above 2 indicate a capable process.
C)both are identical.
D)Cp values for a given process will always be greater than or equal to Cpk values.
E)Cpk values for a given process will always be greater than Cp values.

Question

Quizplus · Accepted Answer

Cp measures the capability of the process to meet specification limits, while Cpk takes into account the process mean and measures how well the process is centered within the specification limits. Therefore, only Cpk ensures the process mean is centered within the limits. Additionally, option B is incorrect as there is no set threshold for Cp and Cpk values indicating a capable process. Option C is also incorrect as Cp and Cpk are not identical. Option D is incorrect as either Cp or Cpk can be greater depending on the process. Option E is also incorrect as Cp values can be greater than Cpk values for some processes.

The Process Capability Measures Cp and Cpk Differ Because