LEAN SIX SIGMA BLACK BELT
CERTIFICATION EXAMINATION
QUESTION AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES
2026 Q&A INSTANT DOWNLOAD PDF
1. Which phase of DMAIC focuses on validating the problem and project
goals?
A. Measure
B. Analyze
C. Define
D. Improve
Answer: C. Define
Rationale: The Define phase clarifies the problem statement, scope,
stakeholders, and project objectives.
2. What is the primary purpose of a SIPOC diagram?
A. Identify root causes
B. Map detailed process steps
C. Define process boundaries and stakeholders
D. Analyze variation
Answer: C. Define process boundaries and stakeholders
Rationale: SIPOC provides a high-level view of Suppliers, Inputs, Process,
Outputs, and Customers.
3. Which statistical test compares means of more than two groups?
A. t-test
B. Chi-square test
, C. ANOVA
D. F-test
Answer: C. ANOVA
Rationale: Analysis of Variance (ANOVA) compares means across three or
more groups.
4. What does CTQ stand for?
A. Cost to Quality
B. Critical to Quality
C. Control to Quality
D. Cost to Quantity
Answer: B. Critical to Quality
Rationale: CTQs are key measurable characteristics important to customer
satisfaction.
5. In hypothesis testing, a Type I error occurs when:
A. Failing to reject a false null hypothesis
B. Rejecting a true null hypothesis
C. Accepting an alternative hypothesis incorrectly
D. Sample size is too large
Answer: B. Rejecting a true null hypothesis
Rationale: Type I error (α) is a false positive.
6. Which tool is most appropriate for prioritizing risks?
A. Pareto chart
B. Fishbone diagram
C. FMEA
D. Control chart
Answer: C. FMEA
Rationale: Failure Modes and Effects Analysis ranks risks using severity,
occurrence, and detection.
7. What does a p-value represent?
A. Probability the alternative hypothesis is true
B. Probability of observing results as extreme as the sample
, C. Confidence level
D. Process capability
Answer: B. Probability of observing results as extreme as the sample
Rationale: The p-value measures evidence against the null hypothesis.
8. Which Lean principle focuses on minimizing work-in-process?
A. Pull
B. Perfection
C. Value
D. Flow
Answer: A. Pull
Rationale: Pull systems produce only what is needed when it is needed.
9. What is the main objective of the Measure phase?
A. Identify solutions
B. Establish baseline performance
C. Implement controls
D. Validate improvements
Answer: B. Establish baseline performance
Rationale: Measure quantifies current performance and validates
measurement systems.
10.Which chart monitors process stability over time?
A. Histogram
B. Pareto chart
C. Control chart
D. Scatter plot
Answer: C. Control chart
Rationale: Control charts distinguish common cause from special cause
variation.
11.What is takt time?
A. Total cycle time
B. Available production time divided by customer demand
C. Setup time
CERTIFICATION EXAMINATION
QUESTION AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES
2026 Q&A INSTANT DOWNLOAD PDF
1. Which phase of DMAIC focuses on validating the problem and project
goals?
A. Measure
B. Analyze
C. Define
D. Improve
Answer: C. Define
Rationale: The Define phase clarifies the problem statement, scope,
stakeholders, and project objectives.
2. What is the primary purpose of a SIPOC diagram?
A. Identify root causes
B. Map detailed process steps
C. Define process boundaries and stakeholders
D. Analyze variation
Answer: C. Define process boundaries and stakeholders
Rationale: SIPOC provides a high-level view of Suppliers, Inputs, Process,
Outputs, and Customers.
3. Which statistical test compares means of more than two groups?
A. t-test
B. Chi-square test
, C. ANOVA
D. F-test
Answer: C. ANOVA
Rationale: Analysis of Variance (ANOVA) compares means across three or
more groups.
4. What does CTQ stand for?
A. Cost to Quality
B. Critical to Quality
C. Control to Quality
D. Cost to Quantity
Answer: B. Critical to Quality
Rationale: CTQs are key measurable characteristics important to customer
satisfaction.
5. In hypothesis testing, a Type I error occurs when:
A. Failing to reject a false null hypothesis
B. Rejecting a true null hypothesis
C. Accepting an alternative hypothesis incorrectly
D. Sample size is too large
Answer: B. Rejecting a true null hypothesis
Rationale: Type I error (α) is a false positive.
6. Which tool is most appropriate for prioritizing risks?
A. Pareto chart
B. Fishbone diagram
C. FMEA
D. Control chart
Answer: C. FMEA
Rationale: Failure Modes and Effects Analysis ranks risks using severity,
occurrence, and detection.
7. What does a p-value represent?
A. Probability the alternative hypothesis is true
B. Probability of observing results as extreme as the sample
, C. Confidence level
D. Process capability
Answer: B. Probability of observing results as extreme as the sample
Rationale: The p-value measures evidence against the null hypothesis.
8. Which Lean principle focuses on minimizing work-in-process?
A. Pull
B. Perfection
C. Value
D. Flow
Answer: A. Pull
Rationale: Pull systems produce only what is needed when it is needed.
9. What is the main objective of the Measure phase?
A. Identify solutions
B. Establish baseline performance
C. Implement controls
D. Validate improvements
Answer: B. Establish baseline performance
Rationale: Measure quantifies current performance and validates
measurement systems.
10.Which chart monitors process stability over time?
A. Histogram
B. Pareto chart
C. Control chart
D. Scatter plot
Answer: C. Control chart
Rationale: Control charts distinguish common cause from special cause
variation.
11.What is takt time?
A. Total cycle time
B. Available production time divided by customer demand
C. Setup time
