Lean Six Sigma Green Belt Certification Assessment 4

Question 1

A Green Belt assesses a supplier's delivery performance using a p-chart. The chart shows the process is in control with an average defective rate of 4%. This means:

Accepted Answer

The process is stable and predictable at the current 4% defective rate

Answer

An in-control process on a p-chart is stable and predictable; while the 4% rate may not be acceptable, it is consistent — improvement requires a fundamental process change, not firefighting.

Question 2

When assessing the potential impact of process inputs, a Green Belt uses FMEA. The Risk Priority Number (RPN) is calculated as:

Accepted Answer

Severity × Occurrence × Detection

Answer

RPN = Severity × Occurrence × Detection, where each factor is rated 1-10, giving a maximum RPN of 1,000 to prioritize corrective actions.

Question 3

A Green Belt is assessing whether two process improvement ideas produce statistically different results. Which statistical test is most appropriate when comparing the means of two independent groups with continuous data?

Accepted Answer

Two-sample t-test

Answer

A two-sample t-test compares the means of two independent groups with continuous data to determine if the difference is statistically significant.

Question 4

During a process assessment, the team discovers that 80% of defects come from 20% of the causes. Which tool visually demonstrates this relationship?

Accepted Answer

Pareto chart

Answer

A Pareto chart displays defects or causes in descending order with a cumulative percentage line, visually illustrating the 80/20 principle for prioritization.

Question 5

A Green Belt performs a linear regression as part of process assessment. The R² value is 0.92. What does this indicate?

Accepted Answer

92% of the variation in Y is explained by the regression model

Answer

R² (coefficient of determination) represents the proportion of variance in the dependent variable (Y) that is explained by the independent variable(s) in the regression model.

Lean Six Sigma Green Belt Certification Practice Test

Lean Six Sigma Green Belt Certification Practice Test

Lean Six Sigma Green Belt Certification Assessment 4