Lean Six Sigma Yellow Belt Certification Lean Six Sigma Yellow Belt The Analyze Phase 1

Question 1

What is the primary purpose of a Pareto chart during the Analyze phase of a Lean Six Sigma project?

Accepted Answer

To identify the 'vital few' causes that account for the majority of the problem

Answer

A Pareto chart applies the 80/20 rule, visually ranking causes by frequency or impact so the team can focus improvement efforts on the 'vital few' factors responsible for most of the defects or waste.

Question 2

When applying the '5 Whys' technique in the Analyze phase, what is the team ultimately trying to uncover?

Accepted Answer

The root cause of a problem by repeatedly questioning each previous answer

Answer

The 5 Whys is a root-cause analysis technique where each answer is challenged with another 'why,' drilling past symptoms to reveal the underlying cause that, if addressed, eliminates the problem.

Question 3

A correlation coefficient (r) of –0.92 between two variables in the Analyze phase most likely indicates:

Accepted Answer

A strong negative linear relationship between the two variables

Answer

A correlation coefficient close to –1 signals a strong negative (inverse) linear relationship: as one variable increases, the other decreases in a consistent, predictable pattern.

Question 4

In the Analyze phase, which type of process variation is caused by factors that are always present and built into the system itself?

Accepted Answer

Common-cause variation

Answer

Common-cause variation is the natural, inherent variability of a stable process resulting from many small, random factors. Reducing it typically requires systemic process redesign, not just fixing isolated incidents.

Question 5

During the Analyze phase, an R-squared (R²) value of 0.85 in a regression model tells the team:

Accepted Answer

85% of the variation in the output variable is explained by the input variable(s) in the model

Answer

R-squared is the coefficient of determination; it measures how much of the variability in the output (Y) is accounted for by the input(s) (X) in the regression model. An R² of 0.85 means the model explains 85% of the output's variation.

Lean Six Sigma Yellow Belt Certification Practice Test

Lean Six Sigma Yellow Belt Certification Practice Test

Lean Six Sigma Yellow Belt Certification Lean Six Sigma Yellow Belt The Analyze Phase 1