FREE Certified Six Sigma Black Belt Questions and Answers Flashcards
6 cards from real Certified Six Sigma Black Belt Exam practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
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Which statistical test is most appropriate for comparing the means of three or more groups in a Six Sigma project?
Answer: One-way ANOVA
One-way ANOVA is used to determine whether there are statistically significant differences between the means of three or more independent groups.
In a Six Sigma DMAIC project, what is the primary purpose of the Control phase?
Answer: Establish monitoring systems to sustain improvements
The Control phase focuses on implementing control plans and monitoring systems to ensure that improvements are maintained over time.
A process has a Cp of 1.5 and a Cpk of 0.8. What does this indicate?
Answer: The process is capable but not centered within specification limits
A Cp of 1.5 shows adequate spread relative to specifications, but the lower Cpk of 0.8 indicates the process mean has shifted away from center.
What is the primary risk of using a high alpha level (e.g., 0.10) in hypothesis testing during a Six Sigma project?
Answer: Increased probability of a Type I error
A higher alpha level increases the probability of rejecting the null hypothesis when it is actually true, which is a Type I error.
Which tool is used to prioritize potential failure modes based on severity, occurrence, and detection ratings?
Answer: Failure Mode and Effects Analysis
FMEA systematically evaluates potential failures by assigning severity, occurrence, and detection scores to calculate a Risk Priority Number.
In Design of Experiments, what is the main advantage of a fractional factorial design over a full factorial design?
Answer: It requires fewer experimental runs while still estimating main effects
Fractional factorial designs reduce the number of runs needed by strategically confounding higher-order interactions that are often negligible.