Practice Flashcards
7 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.
Read the first 7 Practice flashcards as text
A Black Belt uses the DMAIC roadmap for an existing process problem. When should a DFSS (DMADV) approach be used instead?
Answer: When no existing process exists or the current process cannot meet requirements even with improvement
DFSS/DMADV is applied when designing a new process or product, or when the existing process is fundamentally incapable of meeting customer requirements.
In the Control phase, which tool is most appropriate for ensuring long-term process discipline after the Black Belt disengages?
Answer: Control plan
A control plan documents what to monitor, how to measure it, control limits, and response actions to sustain improvements.
Which measure of central tendency is most resistant to the effect of extreme outliers?
Answer: Median
The median is a positional measure unaffected by extreme values, making it more robust than the mean for skewed distributions.
A Black Belt is choosing between an EWMA and an Xbar-R chart. EWMA is preferred when:
Answer: Detecting small, gradual process shifts is the priority
EWMA (Exponentially Weighted Moving Average) charts are more sensitive to small sustained shifts by weighting recent data more heavily.
The cost of poor quality (COPQ) includes which of the following?
Answer: Internal failure, external failure, appraisal, and prevention costs
The full COPQ model includes prevention, appraisal, internal failure, and external failure costs (PAF model).
A team finds that reducing batch size in a manufacturing process decreases lead time significantly. This improvement is best explained by:
Answer: Little's Law: Lead time = WIP ÷ throughput rate
Little's Law demonstrates that reducing work-in-process (WIP) by smaller batch sizes directly reduces lead time.
A Black Belt selects a fractional factorial design (2⁵⁻²) instead of a full factorial. The primary trade-off is:
Answer: Higher-order interactions are confounded with main effects or lower-order interactions
Fractional factorial designs alias (confound) higher-order interactions with main effects or other interactions, reducing resolution.