Lean Six Sigma Yellow Belt Certification Lean Six Sigma Yellow Belt Certification MCQ 3 — Questions and Answers
Question 1: A process has a Cp of 1.5 but a Cpk of 0.8. What does this indicate?
- The process is capable and well-centered
- The process has sufficient spread but is off-center from the target (Correct answer)
- The process is incapable regardless of centering
- The process has too much variation to measure
Correct answer: The process has sufficient spread but is off-center from the target
Cp measures potential capability (spread vs. spec width), while Cpk accounts for centering; a high Cp with low Cpk means the process is shifted toward a specification limit.
Question 2: Which Lean tool is used to visually display the sequence and flow of materials and information needed to deliver a product?
- 5S
- Value Stream Map (Correct answer)
- Kanban Board
- Poka-Yoke
Correct answer: Value Stream Map
A Value Stream Map (VSM) depicts all steps, information flows, and time elements in the process from supplier to customer.
Question 3: What statistical test would you use to compare the means of two independent groups in a Six Sigma project?
- Chi-Square test
- Two-sample t-test (Correct answer)
- Regression analysis
- ANOVA
Correct answer: Two-sample t-test
A two-sample t-test compares the means of two independent groups to determine if there is a statistically significant difference.
Question 4: In 5S methodology, what does the 'Seiton' step (Set in Order) primarily focus on?
- Removing all unnecessary items from the workplace
- Organizing necessary items so they are easy to find and use (Correct answer)
- Cleaning equipment and the work area thoroughly
- Establishing standards to maintain the first three S's
Correct answer: Organizing necessary items so they are easy to find and use
Seiton (Set in Order) involves arranging and labeling necessary items so they are accessible and clearly identified for efficient use.
Question 5: Which of the following is an example of a 'Special Cause' variation in a process?
- Natural fluctuation in machine output due to slight temperature changes
- A machine breakdown causing a sudden spike in defect rates (Correct answer)
- Minor day-to-day variation in employee performance
- Random measurement error within calibration tolerance
Correct answer: A machine breakdown causing a sudden spike in defect rates
Special cause variation is an unexpected, assignable event — like a machine breakdown — that is outside the normal system of variation.
Question 6: What is the purpose of a Gauge R&R study in Six Sigma?
- To identify the root cause of a defect
- To evaluate the repeatability and reproducibility of a measurement system (Correct answer)
- To determine the capability of a production process
- To prioritize improvement opportunities by cost
Correct answer: To evaluate the repeatability and reproducibility of a measurement system
Gauge R&R (Repeatability and Reproducibility) assesses whether the measurement system itself is a significant source of variation.
Question 7: A Yellow Belt team member identifies that a vendor consistently delivers raw materials late, causing production delays. This is best classified as which type of waste?
- Defects
- Waiting (Correct answer)
- Overproduction
- Motion
Correct answer: Waiting
Waiting waste occurs whenever people, machines, or materials are idle because a preceding step hasn't delivered on time.
Lean Six Sigma Yellow Belt Certification Lean Six Sigma Yellow Belt Certification MCQ 3
A process has a Cp of 1.5 but a Cpk of 0.8.
What does this indicate?