Certified Six Sigma Black Belt (Cssbb)
Exam Question And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A Instant Download Pdf
1. Which phase of DMAIC focuses on identifying root causes of defects?
A. Define
B. Measure
C. Analyze
D. Improve
Correct Answer: C
Rationale: The Analyze phase is dedicated to identifying, validating, and
prioritizing root causes of defects or process variation.
2. The primary purpose of a project charter is to:
A. Document statistical results
B. Define scope, goals, and stakeholders
C. Select improvement tools
D. Control process changes
Correct Answer: B
Rationale: A project charter formally defines the project’s scope, objectives,
business case, and key stakeholders.
3. Which metric best reflects customer perception of quality?
A. Yield
, B. Defects per unit
C. Cost of poor quality
D. Voice of the customer
Correct Answer: D
Rationale: Voice of the Customer (VOC) captures customer needs, expectations,
and perceptions of quality.
4. A process operating at Six Sigma quality has approximately how many
defects per million opportunities (DPMO)?
A. 233
B. 3.4
C. 6.0
D. 34
Correct Answer: B
Rationale: Six Sigma performance corresponds to approximately 3.4 defects per
million opportunities.
5. Which tool is most appropriate for prioritizing potential failure modes?
A. SIPOC
B. Control chart
C. FMEA
D. Histogram
Correct Answer: C
Rationale: Failure Modes and Effects Analysis (FMEA) prioritizes risks using
severity, occurrence, and detection ratings.
6. Which hypothesis test compares the means of two independent samples?
A. Paired t-test
B. Two-sample t-test
, C. ANOVA
D. Chi-square
Correct Answer: B
Rationale: A two-sample t-test is used to compare the means of two
independent groups.
7. Which chart is used to monitor process stability over time?
A. Pareto chart
B. Scatter diagram
C. Control chart
D. Box plot
Correct Answer: C
Rationale: Control charts distinguish common-cause from special-cause
variation over time.
8. In Design of Experiments (DOE), what does randomization help prevent?
A. Measurement error
B. Bias from uncontrolled factors
C. Multicollinearity
D. Interaction effects
Correct Answer: B
Rationale: Randomization minimizes bias from lurking or uncontrolled variables.
9. What is the primary objective of the Improve phase?
A. Establish baseline performance
B. Validate measurement systems
C. Implement solutions to eliminate root causes
D. Sustain gains
, Correct Answer: C
Rationale: The Improve phase focuses on developing and implementing
solutions to address verified root causes.
10.Which measurement system property reflects closeness to the true value?
A. Precision
B. Stability
C. Accuracy
D. Linearity
Correct Answer: C
Rationale: Accuracy measures how close a measurement is to the true or
reference value.
11.A Black Belt is MOST likely responsible for:
A. Executing daily process tasks
B. Leading complex improvement projects
C. Providing executive sponsorship
D. Collecting basic data
Correct Answer: B
Rationale: Black Belts lead cross-functional, complex Six Sigma projects using
advanced analytical tools.
12.Which tool identifies all inputs and outputs of a high-level process?
A. Value stream map
B. SIPOC
C. Fishbone diagram
D. Check sheet
Exam Question And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A Instant Download Pdf
1. Which phase of DMAIC focuses on identifying root causes of defects?
A. Define
B. Measure
C. Analyze
D. Improve
Correct Answer: C
Rationale: The Analyze phase is dedicated to identifying, validating, and
prioritizing root causes of defects or process variation.
2. The primary purpose of a project charter is to:
A. Document statistical results
B. Define scope, goals, and stakeholders
C. Select improvement tools
D. Control process changes
Correct Answer: B
Rationale: A project charter formally defines the project’s scope, objectives,
business case, and key stakeholders.
3. Which metric best reflects customer perception of quality?
A. Yield
, B. Defects per unit
C. Cost of poor quality
D. Voice of the customer
Correct Answer: D
Rationale: Voice of the Customer (VOC) captures customer needs, expectations,
and perceptions of quality.
4. A process operating at Six Sigma quality has approximately how many
defects per million opportunities (DPMO)?
A. 233
B. 3.4
C. 6.0
D. 34
Correct Answer: B
Rationale: Six Sigma performance corresponds to approximately 3.4 defects per
million opportunities.
5. Which tool is most appropriate for prioritizing potential failure modes?
A. SIPOC
B. Control chart
C. FMEA
D. Histogram
Correct Answer: C
Rationale: Failure Modes and Effects Analysis (FMEA) prioritizes risks using
severity, occurrence, and detection ratings.
6. Which hypothesis test compares the means of two independent samples?
A. Paired t-test
B. Two-sample t-test
, C. ANOVA
D. Chi-square
Correct Answer: B
Rationale: A two-sample t-test is used to compare the means of two
independent groups.
7. Which chart is used to monitor process stability over time?
A. Pareto chart
B. Scatter diagram
C. Control chart
D. Box plot
Correct Answer: C
Rationale: Control charts distinguish common-cause from special-cause
variation over time.
8. In Design of Experiments (DOE), what does randomization help prevent?
A. Measurement error
B. Bias from uncontrolled factors
C. Multicollinearity
D. Interaction effects
Correct Answer: B
Rationale: Randomization minimizes bias from lurking or uncontrolled variables.
9. What is the primary objective of the Improve phase?
A. Establish baseline performance
B. Validate measurement systems
C. Implement solutions to eliminate root causes
D. Sustain gains
, Correct Answer: C
Rationale: The Improve phase focuses on developing and implementing
solutions to address verified root causes.
10.Which measurement system property reflects closeness to the true value?
A. Precision
B. Stability
C. Accuracy
D. Linearity
Correct Answer: C
Rationale: Accuracy measures how close a measurement is to the true or
reference value.
11.A Black Belt is MOST likely responsible for:
A. Executing daily process tasks
B. Leading complex improvement projects
C. Providing executive sponsorship
D. Collecting basic data
Correct Answer: B
Rationale: Black Belts lead cross-functional, complex Six Sigma projects using
advanced analytical tools.
12.Which tool identifies all inputs and outputs of a high-level process?
A. Value stream map
B. SIPOC
C. Fishbone diagram
D. Check sheet
