The process capability index $(\frac{C_p}{C_{pk}})$

Shows how well the parts being produced fit into the range specified by the design specifications

Defines the mean and standard deviation of the process

Is the ratio of the range of values allowed divided by the range of values produced

Should be $<mn\; id="EditorElement\_909801">1</mn>$ for a capable process

Is the mean divided by the square of the standard deviation $($variance$)$

Should be $=0\mathrm{.}5$ for a capable process