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 chart
- b.Project charter
- c.Control plan
- 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.Compute DPMO
- b.Identify Critical-to-Quality (CTQ) requirements
- c.Run a hypothesis test
- d.Set the control limits
Answer: b
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.50,000
- c.10,000
- d.1,500
Answer: c
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.The control plan
- b.Project ROI
- c.Customer satisfaction
- d.Repeatability and reproducibility of the measurement system
Answer: d
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.Increase the sample to 1,000 first
- b.Do nothing; p-values are irrelevant
- c.Fail to reject the null hypothesis
- d.Reject the null hypothesis
Answer: d
Explanation: Because p (0.03) < alpha (0.05), you reject the null hypothesis.
- 6. Analyze
A correlation coefficient (r) of -0.9 indicates:
- a.A weak positive relationship
- b.A guaranteed causal link
- c.A strong negative linear relationship
- d.No relationship
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.Write the project charter
- b.Monitor a stable process
- c.Compute the p-value only
- d.Systematically study the effect of multiple factors and their interactions
Answer: d
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.Set the USL and LSL
- b.Validate the solution and reduce risk before scaling
- c.Replace the control plan
- d.Skip the Control phase
Answer: b
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.That DPMO is zero
- b.A special (assignable) cause to investigate
- c.That the spec limits are wrong
- d.Common-cause variation
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.Document how to monitor and sustain the improved process
- b.Run a DOE
- c.Define the project charter
- d.Compute Cp
Answer: a
Explanation: A control plan documents monitoring and response to sustain the gains.