Managing for Quality and Performance Excellence 10th Edition by James Evans ,William Lindsay

Exercise 29

Note: Data sets for many problems in this chapter are available in the Excel workbook C09Data.xlsx on the Student Companion Site. Click the appropriate worksheet tab as noted in the problem ( e.g. Prob. 9-12, etc.) to access the data. We also recommend using the ASQ Learn about Quality Excel templates noted in this chapter to facilitate your solutions to appropriate problems.
NanosElectron, Inc. manufactures 75,000 circuit boards per month. A random sample of 800 boards is inspected every week for three characteristics.
During a recent week, four defects were found for one characteristic, two defects were found for another characteristic, and one defect was found for the third characteristic. If these inspections produced defect counts that were representative of the population, what is the overall sigma level for this process? What is the sigma level for the characteristic that showed four defects?