Suppose that a quality characteristic is normally distributed with specification at 10020, the process standard deviation is 6. a) Suppose that the...

Suppose that a quality characteristic is normally distributed with specification at 100±20, the process standard deviation is 6.

a) Suppose that the process mean is 100. What are the natural tolerance limits (± 3σ). What is the fraction defective? Calculate the Cp and Cpk.

b) Suppose the process mean is 106. What are the natural tolerance limits? What is the fraction defective? Calculate the Cp and Cpk. Comment on the comparison of these results to those you obtained in part a.