A process has a process capability index of Cp = 1.2. a. Assume the process mean is set to its optimal value. Express the upper and lower specification limits in terms of the process mean and standard deviation.
b. Using the normal curve, estimate the proportion of units that will be nonconforming.
c. Is it likely or unlikely that the true proportion of nonconforming units will be quite different from the estimate in part (b)? Explain.