Lean Six Sigma Green Belt Certification Knowledge 4

Question 1

Which phase of DMAIC is primarily responsible for implementing and validating solutions?

Accepted Answer

Improve

Answer

The Improve phase develops, pilots, and implements solutions that address confirmed root causes identified in the Analyze phase.

Question 2

In Design of Experiments (DOE), a full factorial design with 3 factors at 2 levels requires how many experimental runs?

Accepted Answer

8

Answer

A full 2^3 factorial design requires 2³ = 8 runs to test all combinations of 3 factors at 2 levels each.

Question 3

What is the key distinction between common cause variation and special cause variation?

Accepted Answer

Common cause is inherent to the process; special cause is from an external, assignable factor

Answer

Common cause variation is the natural, random variation built into a stable process, while special cause variation is due to identifiable, non-routine factors.

Question 4

A Gage R&R study reveals that measurement system variation accounts for 35% of total observed variation. This result indicates:

Accepted Answer

The measurement system needs improvement before data can be trusted

Answer

AIAG guidelines classify a measurement system contributing >30% of total variation as unacceptable and requiring corrective action before use.

Question 5

Which of the following is an example of a 'mistake-proofing' (poka-yoke) device?

Accepted Answer

A USB connector that can only be inserted in the correct orientation

Answer

A USB connector's physical design prevents incorrect insertion, making the error physically impossible — a classic poka-yoke that prevents defects at the source.

Lean Six Sigma Green Belt Certification Practice Test

Lean Six Sigma Green Belt Certification Practice Test

Lean Six Sigma Green Belt Certification Knowledge 4