Knowledge Flashcards
7 cards from real Lean Six Sigma Green Belt Certification practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Knowledge flashcards as text
Which phase of DMAIC is primarily responsible for implementing and validating solutions?
Answer: Improve
The Improve phase develops, pilots, and implements solutions that address confirmed root causes identified in the Analyze phase.
In Design of Experiments (DOE), a full factorial design with 3 factors at 2 levels requires how many experimental runs?
Answer: 8
A full 2^3 factorial design requires 2³ = 8 runs to test all combinations of 3 factors at 2 levels each.
What is the key distinction between common cause variation and special cause variation?
Answer: Common cause is inherent to the process; special cause is from an external, assignable factor
Common cause variation is the natural, random variation built into a stable process, while special cause variation is due to identifiable, non-routine factors.
A Gage R&R study reveals that measurement system variation accounts for 35% of total observed variation. This result indicates:
Answer: The measurement system needs improvement before data can be trusted
AIAG guidelines classify a measurement system contributing >30% of total variation as unacceptable and requiring corrective action before use.
Which of the following is an example of a 'mistake-proofing' (poka-yoke) device?
Answer: A USB connector that can only be inserted in the correct orientation
A USB connector's physical design prevents incorrect insertion, making the error physically impossible — a classic poka-yoke that prevents defects at the source.
In regression analysis, what does the R-squared (R²) value represent?
Answer: The proportion of variation in Y explained by the model
R² measures the proportion of variability in the response variable (Y) that is explained by the predictor variable(s) in the regression model.
The concept of 'Gemba' in Lean Six Sigma refers to:
Answer: The actual place where work is performed
Gemba is Japanese for 'the real place' — in Lean, it means going to the shop floor or actual work location to observe processes directly.