Certified Six Sigma Black Belt (CSSBB) Exam 2026: Professional
Certification Practice Test — DMAIC, Advanced Statistics, Process
Optimization, Design of Experiments & Quality Management — 190
Multiple-Choice Questions with Answers & Detailed Rationales
Question 1
A Black Belt is leading a project to reduce patient wait time in an emergency department.
The project sponsor asks who should approve the project charter. Which role typically holds
this responsibility?
A. The Black Belt leading the project
B. The project Champion or Sponsor
C. The Green Belt supporting data collection
D. The Finance Controller validating savings
Correct Answer: B
Explanation: The Champion or Sponsor, as a senior leader, formally authorizes the project
charter and secures resources.
Question 2
A quality engineer calculates that a process has a Cp of 1.50 and a Cpk of 0.95. What does
this combination indicate about the process?
A. The process is capable and properly centered.
B. The process has potential capability but is off-center.
C. The process spread exceeds specification limits.
D. The process is incapable and requires immediate shutdown.
,Correct Answer: B
Explanation: High Cp with low Cpk signals adequate spread but a significant shift from target.
Question 3
During a Gage R&R study, the total variation is 100 units. Repeatability accounts for 25 units
and reproducibility accounts for 20 units. What is the percentage of study variation (%SV)
attributable to the measurement system?
A. 45%
B. 20%
C. 25%
D. 50%
Correct Answer: A
Explanation: Measurement system variation combines repeatability and reproducibility:
√(25² + 20²) ≈ 32, not simply additive. However, when reported as separate components in
an ANOVA method, the combined %SV requires calculating the square root of the sum of
squares.
Question 4
A team is analyzing why customer complaints have increased despite process metrics
showing improvement. Which tool best helps translate vague customer desires into
measurable design requirements?
A. Pareto chart
,B. Quality Function Deployment (QFD)
C. Control chart
D. Gantt chart
Correct Answer: B
Explanation: QFD systematically converts Voice of the Customer into technical CTQ
requirements.
Question 5
A Black Belt notices that a control chart for a critical dimension shows a pattern of seven
consecutive points steadily increasing. According to Western Electric rules, this signals:
A. Random variation requiring no action
B. A process shift requiring investigation
C. Improved process capability
D. Measurement system failure
Correct Answer: B
Explanation: Seven consecutive increasing points indicate a systematic trend, not random
variation.
Question 6
Which Lean tool is designed to make errors impossible to occur during a process step?
A. Kanban
, B. Poka-Yoke
C. 5S
D. Andon
Correct Answer: B
Explanation: Poka-Yoke (mistake-proofing) prevents errors at the source rather than
detecting them later.
Question 7
A project team has completed a FMEA and identified an RPN of 240 for a failure mode. The
severity rating is 8, occurrence is 5, and detection is 6. If the team implements an
improvement that reduces occurrence to 2 without changing severity or detection, what is
the new RPN?
A. 96
B. 120
C. 80
D. 60
Correct Answer: A
Explanation: RPN = Severity × Occurrence × Detection = 8 × 2 × 6 = 96.
Question 8
In a hypothesis test, the significance level (α) is set at 0.05. What is the probability of
committing a Type I error?
Certification Practice Test — DMAIC, Advanced Statistics, Process
Optimization, Design of Experiments & Quality Management — 190
Multiple-Choice Questions with Answers & Detailed Rationales
Question 1
A Black Belt is leading a project to reduce patient wait time in an emergency department.
The project sponsor asks who should approve the project charter. Which role typically holds
this responsibility?
A. The Black Belt leading the project
B. The project Champion or Sponsor
C. The Green Belt supporting data collection
D. The Finance Controller validating savings
Correct Answer: B
Explanation: The Champion or Sponsor, as a senior leader, formally authorizes the project
charter and secures resources.
Question 2
A quality engineer calculates that a process has a Cp of 1.50 and a Cpk of 0.95. What does
this combination indicate about the process?
A. The process is capable and properly centered.
B. The process has potential capability but is off-center.
C. The process spread exceeds specification limits.
D. The process is incapable and requires immediate shutdown.
,Correct Answer: B
Explanation: High Cp with low Cpk signals adequate spread but a significant shift from target.
Question 3
During a Gage R&R study, the total variation is 100 units. Repeatability accounts for 25 units
and reproducibility accounts for 20 units. What is the percentage of study variation (%SV)
attributable to the measurement system?
A. 45%
B. 20%
C. 25%
D. 50%
Correct Answer: A
Explanation: Measurement system variation combines repeatability and reproducibility:
√(25² + 20²) ≈ 32, not simply additive. However, when reported as separate components in
an ANOVA method, the combined %SV requires calculating the square root of the sum of
squares.
Question 4
A team is analyzing why customer complaints have increased despite process metrics
showing improvement. Which tool best helps translate vague customer desires into
measurable design requirements?
A. Pareto chart
,B. Quality Function Deployment (QFD)
C. Control chart
D. Gantt chart
Correct Answer: B
Explanation: QFD systematically converts Voice of the Customer into technical CTQ
requirements.
Question 5
A Black Belt notices that a control chart for a critical dimension shows a pattern of seven
consecutive points steadily increasing. According to Western Electric rules, this signals:
A. Random variation requiring no action
B. A process shift requiring investigation
C. Improved process capability
D. Measurement system failure
Correct Answer: B
Explanation: Seven consecutive increasing points indicate a systematic trend, not random
variation.
Question 6
Which Lean tool is designed to make errors impossible to occur during a process step?
A. Kanban
, B. Poka-Yoke
C. 5S
D. Andon
Correct Answer: B
Explanation: Poka-Yoke (mistake-proofing) prevents errors at the source rather than
detecting them later.
Question 7
A project team has completed a FMEA and identified an RPN of 240 for a failure mode. The
severity rating is 8, occurrence is 5, and detection is 6. If the team implements an
improvement that reduces occurrence to 2 without changing severity or detection, what is
the new RPN?
A. 96
B. 120
C. 80
D. 60
Correct Answer: A
Explanation: RPN = Severity × Occurrence × Detection = 8 × 2 × 6 = 96.
Question 8
In a hypothesis test, the significance level (α) is set at 0.05. What is the probability of
committing a Type I error?
