FREE Certified Six Sigma Black Belt Assessment 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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A Six Sigma Black Belt notices that a process capability index (Cpk) is 1.0 while Cp is 1.5. What does this indicate?
Answer: The process mean has shifted away from the target
When Cpk is significantly lower than Cp, it indicates the process mean has shifted away from the center of the specification limits.
During the Analyze phase of DMAIC, which tool is most appropriate for identifying the vital few causes from the trivial many?
Answer: Pareto chart
A Pareto chart applies the 80/20 rule to separate the vital few causes that account for most of the effect from the trivial many.
What is the primary purpose of a Measurement System Analysis (MSA) in a Six Sigma project?
Answer: To quantify the amount of variation introduced by the measurement system
MSA quantifies variation attributable to the measurement system itself, ensuring observed data reflects true process variation rather than measurement error.
A Black Belt is using Design of Experiments (DOE) and wants to study 5 factors in the fewest runs possible while accepting that some interactions will be confounded. Which design is most appropriate?
Answer: Fractional factorial design
A fractional factorial design reduces the number of experimental runs by intentionally confounding higher-order interactions with main effects or lower-order interactions.
In hypothesis testing, a Black Belt sets alpha at 0.05 and obtains a p-value of 0.03. The actual reality is that the null hypothesis is true. What type of error has occurred?
Answer: Type I error
Rejecting a true null hypothesis is a Type I error, which occurred here because the p-value fell below alpha despite the null being true.
Which of the following best describes the purpose of a SIPOC diagram in the Define phase?
Answer: To provide a high-level view of the process scope including suppliers, inputs, process, outputs, and customers
A SIPOC diagram provides a high-level overview of the process boundaries and key elements to align the project team on scope during the Define phase.