ASQ Certified Six Sigma Black Belt
Practice Exam Questions and 100%
Correct Answers 2026
1. What is the primary role of a Six Sigma Black Belt?
A. Approve budgets only
B. Perform routine inspections
C. Lead complex improvement projects and mentor Green Belts
D. Handle payroll
2. Which DMAIC phase focuses on identifying customer requirements and project scope?
A. Measure
B. Analyze
C. Improve
D. Define
3. What does SIPOC stand for?
A. System, Input, Procedure, Output, Customer
B. Supplier, Inspection, Process, Output, Cost
C. Supplier, Input, Process, Output, Customer
D. Sample, Input, Product, Output, Customer
4. Which tool is most useful for identifying the few causes responsible for most problems?
A. Scatter diagram
B. Histogram
C. Pareto chart
D. Check sheet
5. A process has 30 defects in 6,000 opportunities. What is the DPMO?
DPMO=(30/6000)×1,000,000
A. 1,000
B. 2,500
C. 5,000
D. 10,000
, 6. Which statistical test is most appropriate for comparing the means of two groups?
A. Chi-square test
B. Correlation test
C. t-test
D. Regression analysis
7. What is the purpose of a control plan?
A. Identify customers
B. Calculate DPMO
C. Sustain improvements after project completion
D. Measure employee performance
8. Which chart is used to monitor subgroup averages over time?
A. p-chart
B. c-chart
C. X-bar chart
D. u-chart
9. A process has a Cp value of 1.50. What does this indicate?
A. The process is not capable
B. The process spread is smaller than the specification spread
C. The process is unstable
D. The process mean is off target
10. Which phase of DMAIC focuses on determining root causes?
A. Define
B. Measure
C. Analyze
D. Control
11. Which type of waste refers to producing items before they are needed?
A. Transportation
B. Motion
C. Overproduction
D. Waiting
12. Which chart is best for monitoring the fraction defective in varying sample sizes?
A. np-chart
B. c-chart
C. p-chart
D. X-bar chart
13. A process has 12 defects in 2,400 opportunities. What is the DPMO?
, DPMO=(12/2400)×1,000,000
A. 1,000
B. 2,500
C. 5,000
D. 10,000
14. Which tool is most useful for brainstorming potential causes of a defect?
A. Histogram
B. Flowchart
C. Fishbone diagram
D. Scatter diagram
15. Which phase of DMAIC focuses on implementing solutions?
A. Analyze
B. Measure
C. Improve
D. Define
16. Which test is most useful for determining whether two categorical variables are related?
A. t-test
B. ANOVA
C. Regression analysis
D. Chi-square test
17. A process has a mean of 100 and a standard deviation of 10. Approximately what percentage of
values fall between 80 and 120?
68%-95%-99.7% { Rule}
A. 68%
B. 95%
C. 99.7%
D. 50%
18. Which chart is most useful for monitoring the number of defects per unit when sample size
varies?
A. c-chart
B. np-chart
C. u-chart
D. X-bar chart
19. Which tool is used to mistake-proof a process?
A. Kaizen
B. Kanban
Practice Exam Questions and 100%
Correct Answers 2026
1. What is the primary role of a Six Sigma Black Belt?
A. Approve budgets only
B. Perform routine inspections
C. Lead complex improvement projects and mentor Green Belts
D. Handle payroll
2. Which DMAIC phase focuses on identifying customer requirements and project scope?
A. Measure
B. Analyze
C. Improve
D. Define
3. What does SIPOC stand for?
A. System, Input, Procedure, Output, Customer
B. Supplier, Inspection, Process, Output, Cost
C. Supplier, Input, Process, Output, Customer
D. Sample, Input, Product, Output, Customer
4. Which tool is most useful for identifying the few causes responsible for most problems?
A. Scatter diagram
B. Histogram
C. Pareto chart
D. Check sheet
5. A process has 30 defects in 6,000 opportunities. What is the DPMO?
DPMO=(30/6000)×1,000,000
A. 1,000
B. 2,500
C. 5,000
D. 10,000
, 6. Which statistical test is most appropriate for comparing the means of two groups?
A. Chi-square test
B. Correlation test
C. t-test
D. Regression analysis
7. What is the purpose of a control plan?
A. Identify customers
B. Calculate DPMO
C. Sustain improvements after project completion
D. Measure employee performance
8. Which chart is used to monitor subgroup averages over time?
A. p-chart
B. c-chart
C. X-bar chart
D. u-chart
9. A process has a Cp value of 1.50. What does this indicate?
A. The process is not capable
B. The process spread is smaller than the specification spread
C. The process is unstable
D. The process mean is off target
10. Which phase of DMAIC focuses on determining root causes?
A. Define
B. Measure
C. Analyze
D. Control
11. Which type of waste refers to producing items before they are needed?
A. Transportation
B. Motion
C. Overproduction
D. Waiting
12. Which chart is best for monitoring the fraction defective in varying sample sizes?
A. np-chart
B. c-chart
C. p-chart
D. X-bar chart
13. A process has 12 defects in 2,400 opportunities. What is the DPMO?
, DPMO=(12/2400)×1,000,000
A. 1,000
B. 2,500
C. 5,000
D. 10,000
14. Which tool is most useful for brainstorming potential causes of a defect?
A. Histogram
B. Flowchart
C. Fishbone diagram
D. Scatter diagram
15. Which phase of DMAIC focuses on implementing solutions?
A. Analyze
B. Measure
C. Improve
D. Define
16. Which test is most useful for determining whether two categorical variables are related?
A. t-test
B. ANOVA
C. Regression analysis
D. Chi-square test
17. A process has a mean of 100 and a standard deviation of 10. Approximately what percentage of
values fall between 80 and 120?
68%-95%-99.7% { Rule}
A. 68%
B. 95%
C. 99.7%
D. 50%
18. Which chart is most useful for monitoring the number of defects per unit when sample size
varies?
A. c-chart
B. np-chart
C. u-chart
D. X-bar chart
19. Which tool is used to mistake-proof a process?
A. Kaizen
B. Kanban
