Delta Steel Corporation produces? “ball bearings” for robotics industry that have design specification of 3.0 inches ±0.08 inches in diameter.?Two-hundred ball bearings from the process were sampled. The results showed that the standard deviation of diameter of these ball bearings was .02 inches.
The upper specification limit for this ball bearing? = ____ inches (round to three decimal places)
The lower specification limit for this ball bearing? = ____ inches (round to three decimal places)
If the process operates at a mean diameter of 3.0 inches.Then the process capability index ?(Cpk?) ?= (round to three decimal places)
From the above result of Cpk we can state that the process is capable of about ____ Sigma performance