ASQ Certified Six Sigma Green Belt
Practice Exam Questions and 100%
Correct Answers 2026
1. What is the main goal of Six Sigma?
A. Increase inventory
B. Reduce employee training
C. Reduce process variation and defects
D. Eliminate audits
2. Which methodology is most commonly associated with Six Sigma improvement
projects?
A. PDCA
B. Kaizen
C. DMAIC
D. 5S
3. What does DMAIC stand for?
A. Define, Measure, Analyze, Improve, Control
B. Define, Measure, Analyze, Improve, Control
C. Develop, Measure, Analyze, Inspect, Correct
D. Define, Manage, Approve, Improve, Control
4. Which phase of DMAIC focuses on identifying customer requirements?
A. Measure
B. Analyze
C. Improve
D. Define
5. Which Six Sigma metric measures defects per million opportunities?
A. Cp
B. Yield
C. DPMO
D. RPN
6. A process has 5 defects in 1,000 opportunities. What is the DPMO?
,DPMO=(Defects / Opportunities)×1,000,000
A. 500
B. 1,000
C. 5,000
D. 50,000
7. Which quality tool is most useful for identifying the “vital few” causes of defects?
A. Histogram
B. Scatter diagram
C. Pareto chart
D. Flowchart
8. Which phase of DMAIC includes collecting baseline process data?
A. Define
B. Measure
C. Analyze
D. Improve
9. Which statistical tool is most useful for showing the relationship between two variables?
A. Histogram
B. Pareto chart
C. Scatter diagram
D. Check sheet
10. What does CTQ stand for in Six Sigma?
A. Cost to Quality
B. Control Through Quality
C. Critical to Quality
D. Capability to Quantify
11. Which phase of DMAIC focuses on identifying root causes?
A. Measure
B. Analyze
C. Improve
D. Control
12. A process has 20 defects in 2,000 opportunities. What is the DPMO?
DPMO=(20/2000)×1,000,000
, A. 1,000
B. 5,000
C. 10,000
D. 20,000
13. Which quality tool is most useful for brainstorming possible causes of a problem?
A. Histogram
B. Fishbone diagram
C. Run chart
D. Check sheet
14. Which chart is most useful for monitoring process stability over time?
A. Pareto chart
B. Histogram
C. Control chart
D. Scatter diagram
15. What is the primary purpose of a SIPOC diagram?
A. Calculate DPMO
B. Determine process capability
C. Identify suppliers, inputs, process, outputs, and customers
D. Track defects over time
16. Which Six Sigma role typically leads improvement projects?
A. White Belt
B. Yellow Belt
C. Green Belt
D. Sponsor
17. A process has a mean of 50 and a standard deviation of 5. Approximately what
percentage of values fall between 45 and 55?
A. 50%
B. 68%
C. 95%
D. 99.7%
18. Which phase of DMAIC focuses on implementing solutions?
A. Measure
B. Analyze
Practice Exam Questions and 100%
Correct Answers 2026
1. What is the main goal of Six Sigma?
A. Increase inventory
B. Reduce employee training
C. Reduce process variation and defects
D. Eliminate audits
2. Which methodology is most commonly associated with Six Sigma improvement
projects?
A. PDCA
B. Kaizen
C. DMAIC
D. 5S
3. What does DMAIC stand for?
A. Define, Measure, Analyze, Improve, Control
B. Define, Measure, Analyze, Improve, Control
C. Develop, Measure, Analyze, Inspect, Correct
D. Define, Manage, Approve, Improve, Control
4. Which phase of DMAIC focuses on identifying customer requirements?
A. Measure
B. Analyze
C. Improve
D. Define
5. Which Six Sigma metric measures defects per million opportunities?
A. Cp
B. Yield
C. DPMO
D. RPN
6. A process has 5 defects in 1,000 opportunities. What is the DPMO?
,DPMO=(Defects / Opportunities)×1,000,000
A. 500
B. 1,000
C. 5,000
D. 50,000
7. Which quality tool is most useful for identifying the “vital few” causes of defects?
A. Histogram
B. Scatter diagram
C. Pareto chart
D. Flowchart
8. Which phase of DMAIC includes collecting baseline process data?
A. Define
B. Measure
C. Analyze
D. Improve
9. Which statistical tool is most useful for showing the relationship between two variables?
A. Histogram
B. Pareto chart
C. Scatter diagram
D. Check sheet
10. What does CTQ stand for in Six Sigma?
A. Cost to Quality
B. Control Through Quality
C. Critical to Quality
D. Capability to Quantify
11. Which phase of DMAIC focuses on identifying root causes?
A. Measure
B. Analyze
C. Improve
D. Control
12. A process has 20 defects in 2,000 opportunities. What is the DPMO?
DPMO=(20/2000)×1,000,000
, A. 1,000
B. 5,000
C. 10,000
D. 20,000
13. Which quality tool is most useful for brainstorming possible causes of a problem?
A. Histogram
B. Fishbone diagram
C. Run chart
D. Check sheet
14. Which chart is most useful for monitoring process stability over time?
A. Pareto chart
B. Histogram
C. Control chart
D. Scatter diagram
15. What is the primary purpose of a SIPOC diagram?
A. Calculate DPMO
B. Determine process capability
C. Identify suppliers, inputs, process, outputs, and customers
D. Track defects over time
16. Which Six Sigma role typically leads improvement projects?
A. White Belt
B. Yellow Belt
C. Green Belt
D. Sponsor
17. A process has a mean of 50 and a standard deviation of 5. Approximately what
percentage of values fall between 45 and 55?
A. 50%
B. 68%
C. 95%
D. 99.7%
18. Which phase of DMAIC focuses on implementing solutions?
A. Measure
B. Analyze
