Your company manufactures 25,000 LCD TV Screens per month for worldwide distribution. You randomly sample 800 units each week, looking for three characteristics. During a recent week, 4 defects were found for one characteristic, two defects were found for another characteristic and one defect was found for the third characteristic. If these defect counts are 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?