Reconsider Exercise 15-1. Suppose that the quality characteristic is normally distributed with specification at 220 ± 40. What is the fallout level? Estimate PCR and PCR_k and interpret these ratios.

Exercise 15-1

Control charts for X̅ and R are to be set up for an important quality characteristic. The sample size is n = 5, and x̅ and r are computed for each of 35 preliminary samples.