1. A certain process has an upper specification limit of 220 and a lower specification limit of 160. The process standard deviation is 6, and the mean is 170. a. Calculate Cp and Cpk for this process. b. What could be done to improve the process capability Cpk to 1.0? 2. A certain process is under statistical control and has a mean value of µ = 130 and a standard deviation of σ = 8. The specifications for this process are USL = 150, LSL = 100. a. Calculate Cp and Cpk. b. Which of these indices is a better measure of process capability? Why? c. Assuming a normal distribution, what percent of the output can be expected to fall outside the specifications?

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