Lean Six Sigma Green Belt Certification Prep 2

Question 1

Which DMAIC phase focuses on identifying the root causes of a problem using statistical analysis?

Accepted Answer

Analyze

Answer

The Analyze phase uses statistical tools and root cause analysis methods to identify the true sources of variation and defects.

Question 2

A process has a Cp of 1.5 but a Cpk of 0.8. What does this indicate?

Accepted Answer

The process has sufficient spread but is off-center

Answer

When Cp > Cpk, the process variation fits within spec limits but the mean is shifted away from the target, indicating a centering problem.

Question 3

What is the primary purpose of a SIPOC diagram in a Six Sigma project?

Accepted Answer

To provide a high-level view of the process including Suppliers, Inputs, Process, Outputs, and Customers

Answer

A SIPOC diagram gives a high-level process overview that helps scope the project and identify key stakeholders before detailed mapping begins.

Question 4

In hypothesis testing, what does a p-value of 0.03 mean when the significance level (α) is 0.05?

Accepted Answer

Reject the null hypothesis

Answer

Since p-value (0.03) < α (0.05), there is sufficient evidence to reject the null hypothesis.

Question 5

Which lean waste category describes producing more than customer demand requires?

Accepted Answer

Overproduction

Answer

Overproduction is considered the worst of the seven wastes in Lean because it generates other wastes like excess inventory and transportation.

Lean Six Sigma Green Belt Certification Practice Test