Certified Six Sigma Black Belt Exam Cheat Sheet 2026

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

1. What is the primary purpose of calculating statistical power in a hypothesis test? → To determine the sample size needed
2. When conducting a two-proportion test, which assumption must be satisfied? → The expected number of successes and failures in each sample should be at least five
3. Which organizational structure element is MOST critical for sustaining a Six Sigma deployment beyond the first two years? → A formal project selection and prioritization process tied to strategic planning
4. What is the null hypothesis in a one-way ANOVA test? → All group means are equal
5. What is the main advantage of using a fractional factorial design instead of a full factorial design? → It requires fewer experimental runs while still estimating main effects
6. When the sampling technique utilized results in a discrepancy between the sample result and the population value, the discrepancy is known as → Bias
7. A Black Belt increases sample size from 30 to 120 while keeping significance level constant. What is the primary effect on the hypothesis test? → Power of the test increases
8. Which prerequisite must be verified BEFORE conducting a process capability analysis? → The process must be in statistical control
9. The objective of a measuring system analysis is to evaluate the statistical characteristics of → Process stability
10. Which type of measurement system error is indicated when measurements consistently read 0.05 units higher than the true reference value? → Bias error
11. A process has Cp = 1.5 and Cpk = 0.8. What does this indicate? → The process has sufficient spread but is significantly off-center
12. What happens to the Cpk value when the process mean shifts closer to a specification limit? → Cpk decreases because the distance to the nearest limit shrinks
13. Which tool is used to prioritize potential failure modes based on severity, occurrence, and detection ratings? → Failure Mode and Effects Analysis
14. An organization is expanding Six Sigma from manufacturing into its finance and HR departments. Which deployment challenge is MOST likely to arise? → Inability to define CTQ characteristics in transactional processes
15. A Black Belt calculates that a process produces 3.4 defects per million opportunities. What sigma level does this represent? → 6 sigma
16. A Six Sigma Black Belt notices that a process capability index (Cpk) is 1.0 while Cp is 1.5. What does this indicate? → The process mean has shifted away from the target
17. In the Kano Model, which category of requirements leads to customer dissatisfaction only when absent but does not increase satisfaction when exceeded? → Must-be (basic) requirements
18. What is the purpose of a Box-Cox transformation in Six Sigma analysis? → To transform non-normal data to approximate normality
19. Which of the following is the primary advantage of using a fractional factorial design over a full factorial? → It reduces the number of runs while still estimating main effects
20. When transforming non-normal data for use with standard SPC charts, which approach should be attempted first? → Apply a Box-Cox transformation to achieve approximate normality
21. A Gage R&R study evaluates: → Measurement system reliability (repeatability and reproducibility)
22. In Design of Experiments, what is the main advantage of a fractional factorial design over a full factorial design? → It requires fewer experimental runs while still estimating main effects
23. A process has a Cp of 1.33 and a Cpk of 0.89. What does this indicate? → The process is capable but not centered within the specification limits
24. What is the key difference between Cpk and Ppk? → Cpk uses within-subgroup (short-term) variation; Ppk uses total (long-term) variation
25. The data collector should be ethical, which is a crucial component of data collection. → Know how the data are to be used
26. In Lean thinking, what does the term 'muda' specifically refer to? → Waste
27. What instrument is employed to evaluate the importance of factors in either a full- or a fractional-factorial experiment structure? → Analysis of variance (ANOVA)
28. What is the significance of the term 'sigma level' when a process operates at 6 sigma with a 1.5 sigma shift? → The process produces 3.4 defects per million opportunities
29. In a Six Sigma DMAIC project, what is the primary purpose of the Control phase? → Establish monitoring systems to sustain improvements
30. What does a Cp value of 1.33 indicate about a process? → The process is capable with some margin of safety