Prep Flashcards
7 cards from real Lean Six Sigma Yellow 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 Prep flashcards as text
A team creates a fishbone (Ishikawa) diagram. Which of the following is NOT a standard category of causes used in manufacturing?
Answer: Customers
The standard 6M fishbone categories in manufacturing are: Man, Machine, Method, Material, Measurement, and Mother Nature (Environment) — not Customers.
What does a control chart's Upper Control Limit (UCL) represent?
Answer: Three standard deviations above the process mean, indicating common cause variation boundaries
UCL is calculated as the mean plus 3 sigma (3 standard deviations) and represents the upper boundary of expected natural process variation.
Which DMAIC phase focuses on identifying the root cause of the problem?
Answer: Analyze
The Analyze phase uses statistical and graphical tools to identify and verify the root causes driving the problem identified in Define and quantified in Measure.
A team plots cycle time vs. batch size and finds a strong positive correlation. This analysis is best visualized using a:
Answer: Scatter diagram
A scatter diagram plots two variables against each other to visually reveal whether and how strongly they are correlated.
In Lean, 'takt time' represents:
Answer: The rate at which customers demand products, calculated as available time divided by customer demand
Takt time = Available Production Time / Customer Demand; it sets the production rhythm needed to meet customer demand without overproducing.
A Yellow Belt should primarily support which of the following on a Six Sigma project?
Answer: Data collection, local process knowledge, and implementing improvements in their work area
Yellow Belts are frontline contributors who provide process expertise, assist with data collection, and help implement solutions designed by higher belts.
Which statement best describes the difference between 'special cause' and 'common cause' variation?
Answer: Special cause variation is unpredictable and from specific identifiable sources; common cause is inherent, random variation in the system
Special cause variation is unusual, identifiable, and must be eliminated; common cause variation is natural system noise that requires process redesign to reduce.