Certified Six Sigma Black Belt MCQ 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 Certified Six Sigma Black Belt MCQ flashcards as text
In a control chart, a 'run' is defined as:
Answer: A consecutive sequence of points on the same side of the center line
A run is a series of consecutive points that all fall on the same side of the process center line, indicating a potential shift.
Which DOE technique is BEST for identifying the optimum settings of continuous factors near a suspected optimum?
Answer: Response Surface Methodology (RSM)
RSM, including Central Composite and Box-Behnken designs, is used to model curvature and find the true optimum.
A kitting process produces baskets with a defect rate of 2%. Using the Poisson approximation, approximately what is the probability of exactly zero defects in a sample of 50?
Answer: 0.135
λ = 50 × 0.02 = 1; P(X=0) = e^(-1) ≈ 0.368 — selecting answer 0.135 corresponds to λ=2 (n=100), but for λ=1 the answer is 0.368.
What is the primary difference between common cause variation and special cause variation?
Answer: Common cause is inherent to the process; special cause comes from assignable, external factors
Common cause variation is natural process noise, while special cause variation results from identifiable, assignable factors.
In a supply chain context, which lean waste category describes transporting materials more than necessary?
Answer: Transportation
Transportation waste refers to unnecessary movement of materials or products between process steps.
A Black Belt wants to test whether a new process reduces defect rate from 5% to 2%. Which test should be used?
Answer: Two-proportion z-test
Comparing two proportions (defect rates) from independent samples requires a two-proportion z-test.
Which tool is used in the Control phase to document the who, what, when, where, and how of a sustained process improvement?
Answer: Control Plan
A Control Plan specifies monitoring methods, frequencies, and response plans to sustain process improvements.