The Cpk index measures the difference between the desired and actual dimensions of goods or services produced.

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The Cpk index is a statistical tool used to measure the capability of a process to meet specifications or requirements. It compares the distribution of a process with the specification limits to determine if the process is capable of producing within those limits. A Cpk value of 1 or greater indicates that the process is capable of meeting specifications, while a value less than 1 indicates that the process needs improvement. Therefore, the Cpk index does measure the difference between the desired and actual dimensions of goods or services produced.

The Cpk Index Measures the Difference Between the Desired and Actual