Lean Six Sigma Yellow Belt Certification Lean Six Sigma Yellow Belt The Analyze Phase Questions and Answers 2 — Questions and Answers
Question 1: Which graphical tool is used in the Analyze phase to display the relationship between two continuous variables?
- Scatter diagram (Correct answer)
- Pareto chart
- Histogram
- Control chart
Correct answer: Scatter diagram
A scatter diagram plots paired data points to reveal correlation or relationships between two continuous variables.
Question 2: What is the primary purpose of a hypothesis test during the Analyze phase?
- To determine if observed differences are statistically significant (Correct answer)
- To collect baseline data for the project
- To define the project scope
- To implement process improvements
Correct answer: To determine if observed differences are statistically significant
Hypothesis testing uses statistical methods to determine whether observed differences in data are due to real effects or random chance.
Question 3: In a cause-and-effect diagram, what do the 'bones' branching off the main spine represent?
- Categories of potential causes (Correct answer)
- Steps in the process flow
- Customer requirements
- Measurement data points
Correct answer: Categories of potential causes
The bones of a fishbone diagram represent major categories such as Man, Machine, Method, Material, Measurement, and Environment.
Question 4: What does a p-value less than 0.05 typically indicate in the Analyze phase?
- The result is statistically significant and the null hypothesis should be rejected (Correct answer)
- The process is in statistical control
- The sample size is too small
- The data follows a normal distribution
Correct answer: The result is statistically significant and the null hypothesis should be rejected
A p-value below 0.05 means there is less than a 5% probability the result occurred by chance, leading to rejection of the null hypothesis.
Question 5: Which technique involves asking 'why' repeatedly to drill down to the fundamental cause of a problem?
- 5 Whys (Correct answer)
- FMEA
- Benchmarking
- Voice of the Customer
Correct answer: 5 Whys
The 5 Whys technique involves iteratively asking why a problem occurs until the root cause is uncovered.
Question 6: What is the purpose of a multi-vari chart in the Analyze phase?
- To identify the largest source of variation among multiple factors (Correct answer)
- To track defects per million opportunities
- To map the entire value stream
- To calculate process capability indices
Correct answer: To identify the largest source of variation among multiple factors
A multi-vari chart displays variation from multiple sources simultaneously to help identify which factor contributes most to process variation.
