Lean Six Sigma Yellow Belt Certification General 2 — Questions and Answers
Question 1: Which phase of DMAIC focuses on identifying the root cause of defects?
- Define
- Measure
- Analyze (Correct answer)
- Improve
Correct answer: Analyze
The Analyze phase uses tools like fishbone diagrams and 5 Whys to identify root causes of defects.
Question 2: What does 'Sigma' measure in a Six Sigma process?
- Average output speed
- Process variation or standard deviation (Correct answer)
- Number of defects per unit
- Customer satisfaction score
Correct answer: Process variation or standard deviation
Sigma (σ) is a statistical measure of variation or standard deviation from the mean in a process.
Question 3: A process operating at 6 Sigma has approximately how many defects per million opportunities (DPMO)?
- 3.4 (Correct answer)
- 66,807
- 308,537
- 1,000
Correct answer: 3.4
A Six Sigma process produces only 3.4 defects per million opportunities, representing near-perfect quality.
Question 4: What is the primary purpose of a Control Chart in Lean Six Sigma?
- To train new employees
- To monitor process stability over time (Correct answer)
- To map customer requirements
- To calculate process capability
Correct answer: To monitor process stability over time
Control charts display process data over time to detect unusual variation and determine if a process is in statistical control.
Question 5: Which of the following best describes 'Value-Added' activities in a Lean process?
- Activities that consume the most time
- Activities the customer is willing to pay for (Correct answer)
- Activities performed by management only
- Activities that reduce employee workload
Correct answer: Activities the customer is willing to pay for
Value-added activities are those that transform inputs in ways customers value and are willing to pay for.
Question 6: What is the role of a Yellow Belt in a Lean Six Sigma organization?
- Lead large-scale improvement projects independently
- Serve as subject matter experts and support Green/Black Belt projects (Correct answer)
- Approve project budgets and resources
- Conduct executive-level strategic planning
Correct answer: Serve as subject matter experts and support Green/Black Belt projects
Yellow Belts provide subject matter expertise and participate in improvement teams led by Green or Black Belts.
Question 7: Which waste type in Lean refers to producing more than what the customer currently needs?
- Waiting
- Overproduction (Correct answer)
- Defects
- Motion
Correct answer: Overproduction
Overproduction is considered the worst Lean waste because it creates inventory and hides other problems.
Lean Six Sigma Yellow Belt Certification General 2
Which phase of DMAIC focuses on identifying the root cause of defects?