A process that produces computer chips has a mean of 04 defe

A process that produces computer chips has a mean of .04 defective chip and chip. The allowable variation is from .038 to .042 defective Compute the capability index (C_p) for the process. Is the process capable?

Solution

A) Capability index = (0.042 – 0.038)/ (2x 0.003)

                               = 0.667

B) Yes, the process capability index indicates that the process will produce virtually 100 percent conforming output (that is the range of the process output permitted by specifications is larger than the actual range of the process).