Lean Six Sigma Black Belt Certification Cheat Sheet 2026

The 30 highest-yield Lean Six Sigma Black Belt Certification facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. What sort of outcomes are anticipated from Six Sigma initiatives from a Black Belt? → At least 200,000 USD as annual benefit
2. A tollgate review at the end of the Measure phase reveals that the team's data collection plan has significant gaps. What is the correct action? → Return to Measure to revise and complete the data collection plan
3. Which statistical test is most appropriate for comparing the means of three or more groups in a Lean Six Sigma project? → ANOVA
4. Six Sigma aids in enhancing: → Customer Satisfaction and Profits
5. In hypothesis testing, what does a Type II error represent in a Six Sigma context? → Failing to reject the null hypothesis when it is actually false
6. When conducting an ANOVA test across four process groups, what does a statistically significant F-statistic tell you? → At least one group mean differs from the others
7. A Black Belt discovers that a critical X variable has a non-normal distribution. Which approach should be used to establish process capability? → Use a Box-Cox transformation or non-normal capability analysis
8. What does Cp measure in process capability analysis? → The potential capability of a process when centered between specification limits
9. A Black Belt's project team has stalled because a critical resource was reassigned to another initiative. What should the Black Belt do FIRST? → Assess the impact on the project timeline and deliverables before escalating
10. Approximately 68% of the data in a normal distribution will fall within: → +/- 1 standard deviation
11. What are the two factors that contribute to the accuracy of measurement systems? → Repeatability and Reproducibility
12. What is the minimum sample size rule of thumb for establishing a reliable process capability study? → At least 50 data points
13. What is the typical cycle time per unit in seconds for a process with an average throughput of 7,200 units per hour? → 0.5
14. What is the primary purpose of a CUSUM chart in SPC? → To detect small, sustained shifts in the process mean over time
15. What is the role of hoshin kanri in a Lean enterprise? → It is the method for aligning strategic objectives across all organizational levels
16. What is the relationship between confidence level and significance level (alpha) in hypothesis testing? → Confidence level equals 1 minus alpha
17. What does DFSS stand for in the context of Six Sigma methodology? → Design for Six Sigma
18. Who can be the process's output's recipient? → Internal or external customers
19. What assumption must be verified before using a two-sample t-test to compare process means? → Data should be approximately normally distributed
20. The separation between two points is being measured by an operator. Which is most susceptible to operator influence? → Precision of the measurement
21. Use of control charts is intended to: → evaluate process performance over time.
22. A process has an X-bar chart with UCL = 50.5, CL = 50.0, and LCL = 49.5. If a single point plots at 50.7, what is the correct interpretation? → The process has a special cause variation
23. A Black Belt needs to assess whether operators measure parts consistently. Which analysis is most appropriate? → Gage R&R with crossed design
24. Quality Function Deployment (QFD) is primarily used in DFSS to accomplish which of the following? → Translate customer requirements into technical design specifications
25. What does a significant interaction effect in a DOE indicate? → The effect of one factor depends on the level of another factor
26. In a Design of Experiments (DOE), when the effect of one factor on the output response is dependent on the level of another factor, this phenomenon is known as: → An interaction effect
27. Which approach best supports knowledge sharing across a Lean enterprise with multiple sites? → Yokoten — the practice of laterally deploying proven improvements to other areas
28. In Design FMEA (DFMEA), the Risk Priority Number (RPN) is calculated as: → Severity × Occurrence × Detection
29. What is the significance of 'value' as defined by the customer in Lean enterprise principles? → Value is whatever the customer is willing to pay for based on their needs
30. Which resolution in a fractional factorial design allows estimation of all main effects but confounds them with two-factor interactions? → Resolution III