Free Certified Six Sigma Black Belt MCQ 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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During the Control phase, a Black Belt needs to monitor both the process mean and variability simultaneously. Which control chart combination should be used for subgroup sizes of 5?
Answer: X-bar and R chart
X-bar and R charts are the standard combination for monitoring the mean and range of a process when subgroup sizes are between 2 and 10.
In Design of Experiments (DOE), what is the primary 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 confounding higher-order interactions, allowing efficient screening of main effects.
A process has a defect rate of 3,400 DPMO. What is the approximate sigma level of this process?
Answer: 4.0 sigma
A DPMO of 3,400 corresponds to approximately a 4.0 sigma process level when including the standard 1.5 sigma shift.
Which tool is used in the Analyze phase to identify the vital few factors from the trivial many?
Answer: Pareto chart
The Pareto chart applies the 80/20 rule to visually separate the vital few causes that account for most of the problem from the trivial many.
What is the purpose of a tollgate review in the DMAIC methodology?
Answer: To formally evaluate whether a phase's deliverables are complete before moving to the next phase
Tollgate reviews are formal checkpoints at the end of each DMAIC phase to verify that all required deliverables are complete and the project is ready to advance.
In hypothesis testing, what does a Type II error represent in a Six Sigma context?
Answer: Failing to reject the null hypothesis when it is actually false
A Type II error (beta error) occurs when we fail to detect a real difference or effect, essentially missing a true problem or improvement.