Lean Six Sigma Black Belt Practice Exam Practice Test
Frequently asked questions
How many Lean Six Sigma Black Belt Practice Exam practice questions are here?+
A full bank of original Lean Six Sigma Black Belt Practice Exam practice questions across the official content areas, weighted like the real exam, with explanations. Free, no signup.
What is the Lean Six Sigma Black Belt Practice Exam exam like?+
A multiple-choice exam. Practice by topic here, then take the full timed mock exam to gauge readiness.
Are these the real exam questions?+
No. Every question is 100% original, written from public primary sources with explanations. We never copy real exam questions or paid prep material.
Can I study in Chinese or Spanish?+
PrepPass practice is in English, 中文 and Español. The official exam is in English — switch the question language to English any time to rehearse the exact terminology you'll see on test day.
Sample practice questions
A few real questions from this free bank, with full explanations. Use the practice tool above for the whole set.
- 1. Define & Team Leadership
Which document formally authorizes a Six Sigma project and defines its scope, goal, and team?
- a.Control plan
- b.Project charter
- c.Control chart
- d.Gage R&R report
Answer: b
Explanation: The project charter authorizes the project and defines scope, goals, and roles.
- 2. Define & Team Leadership
'Voice of the Customer' (VOC) is used primarily to:
- a.Set the control limits
- b.Compute DPMO
- c.Identify Critical-to-Quality (CTQ) requirements
- d.Run a hypothesis test
Answer: c
Explanation: VOC is translated into measurable CTQ requirements.
- 3. Measure
A process produces 15 defects across 300 units, each with 5 defect opportunities. What is the DPMO?
- a.5,000
- b.10,000
- c.1,500
- d.50,000
Answer: b
Explanation: DPMO = 15 / (300 x 5) x 1,000,000 = 15/1500 x 1,000,000 = 10,000.
- 4. Measure
Gage R&R (a Measurement System Analysis) assesses:
- a.Customer satisfaction
- b.Project ROI
- c.Repeatability and reproducibility of the measurement system
- d.The control plan
Answer: c
Explanation: Gage R&R quantifies measurement variation from equipment (repeatability) and appraisers (reproducibility).
- 5. Analyze
In hypothesis testing, if the p-value is 0.03 and alpha is 0.05, you should:
- a.Fail to reject the null hypothesis
- b.Reject the null hypothesis
- c.Increase the sample to 1,000 first
- d.Do nothing; p-values are irrelevant
Answer: b
Explanation: Because p (0.03) < alpha (0.05), you reject the null hypothesis.
- 6. Analyze
A correlation coefficient (r) of -0.9 indicates:
- a.No relationship
- b.A weak positive relationship
- c.A strong negative linear relationship
- d.A guaranteed causal link
Answer: c
Explanation: r = -0.9 indicates a strong negative linear correlation (correlation is not causation).
- 7. Improve & DOE
Design of Experiments (DOE) is used to:
- a.Monitor a stable process
- b.Systematically study the effect of multiple factors and their interactions
- c.Write the project charter
- d.Compute the p-value only
Answer: b
Explanation: DOE varies factors deliberately to identify significant effects and interactions.
- 8. Improve & DOE
A pilot of an improvement is run before full rollout mainly to:
- a.Replace the control plan
- b.Skip the Control phase
- c.Validate the solution and reduce risk before scaling
- d.Set the USL and LSL
Answer: c
Explanation: Piloting validates the improvement and reduces risk before full implementation.
- 9. Control & SPC
On a control chart, a single point beyond the upper control limit indicates:
- a.Common-cause variation
- b.A special (assignable) cause to investigate
- c.That the spec limits are wrong
- d.That DPMO is zero
Answer: b
Explanation: A point beyond the control limits signals special-cause variation to investigate.
- 10. Control & SPC
The main purpose of a control plan in the Control phase is to:
- a.Define the project charter
- b.Run a DOE
- c.Document how to monitor and sustain the improved process
- d.Compute Cp
Answer: c
Explanation: A control plan documents monitoring and response to sustain the gains.