The process capability index (indicated by Cpk) can be used only when the process is centered.

Name: The process capability index (indicated by Cpk) can be used only when the process is centered.
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The process capability index can be used even if the process is not centered, but it will provide more accurate results if the process is centered. If the process is not centered, it may be necessary to use other statistical tools to identify and correct the underlying issues before using Cpk.

The Process Capability Index (Indicated by Cpk) Can Be Used