General 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 General flashcards as text
What is the primary goal of the Control phase in DMAIC?
Answer: Sustain process gains and prevent reversion to old performance levels
The Control phase implements control plans, updated SOPs, and monitoring systems to ensure the process improvements are maintained long-term.
A Black Belt uses a scatter plot and finds r = −0.92 between two variables. What does this indicate?
Answer: A strong negative linear relationship
A Pearson correlation coefficient of −0.92 indicates a strong negative linear relationship — as one variable increases, the other tends to decrease significantly.
Which Lean waste category is represented when a machine operator waits for the previous step to complete before beginning their work?
Answer: Waiting
Waiting is one of the eight Lean wastes (DOWNTIME), describing idle time when people, equipment, or materials are not moving or being worked on.
A team is deciding between two process improvement solutions. Using a Pugh Concept Selection Matrix, what serves as the datum?
Answer: The current process or a reference concept against which alternatives are compared
The datum in a Pugh Matrix is the baseline reference (often the current process) against which all alternative concepts are evaluated as better (+), worse (−), or same (S).
In the context of Design for Six Sigma (DFSS), what does the DMADV roadmap stand for?
Answer: Define, Measure, Analyze, Design, Verify
DMADV stands for Define, Measure, Analyze, Design, Verify — a structured methodology used to design new products or processes to Six Sigma quality levels.
What is the purpose of conducting a Normality test (e.g., Anderson-Darling) before performing a parametric statistical test?
Answer: To verify that the data meets the normality assumption required by parametric tests
Parametric tests like t-tests and ANOVA assume the underlying population is normally distributed; the Anderson-Darling test checks whether this assumption is valid.
A Black Belt discovers that the Cpk of a process is significantly lower than its Cp. What does this comparison reveal?
Answer: The process is not centered — the mean is shifted toward one specification limit
Cp measures potential capability (spread only), while Cpk accounts for both spread and centering; a large gap between them indicates the process mean is not centered within the specification limits.