Role of Six Sigma Concept in Lean Management 4. Six Sigma concept: 1. When a process is said to be at six sigma level, what does it mean? (7 points) 2. When a process is said to be at 4 sigma level, what does it mean? How would you compare it with a process at six sigma level? (7 points) 3. What is DPMO? What does O stand for? Why? (6 points) I am attaching the Excel spreadsheet that I showed in class (scratch work) as additional reference. 5. What are the positive effects of the Six Sigma Concept on Business Operations? Discuss this briefly in a paragraph. (10 points) 6. What are the positive effects of DMAIC approach? Discuss this briefly in a paragraph. (10 points) 7. What are some criticisms of the Six Sigma approach? Discuss this briefly in a paragraph. (10 points)