Lean Six Sigma Green Belt Certification DMAIC: Improve and Control 2

Question 1

A Green Belt team has identified three potential solutions with similar cost. Which technique best prioritizes them based on impact versus effort?

Accepted Answer

Pugh concept selection matrix

Answer

A Pugh concept selection matrix scores competing solutions against weighted criteria such as impact, cost, and feasibility to guide selection.

Question 2

During a pilot run of a new process, the team observes that output variability decreased but the mean shifted away from target. What is the most likely next step?

Accepted Answer

Adjust process settings to re-center the mean while preserving reduced variability

Answer

When a pilot reduces variability but shifts the mean, the team should tune the control factors (e.g., setpoints) to re-center output without sacrificing the variability gains.

Question 3

Which type of mistake-proofing device physically prevents a defect from being passed to the next step?

Accepted Answer

Detection poka-yoke

Answer

A detection poka-yoke identifies a defect after it occurs and prevents it from moving forward, while a control (prevention) poka-yoke stops the defect from being made at all.

Question 4

A control chart shows a process in statistical control, but customer complaints persist. What should the team investigate first?

Accepted Answer

Check whether the control chart specifications match customer requirements

Answer

A process can be statistically stable yet still fail to meet customer specs if the control limits were set without reference to specification limits.

Question 5

In Design of Experiments, what does 'confounding' mean?

Accepted Answer

The effect of one factor cannot be separated from the effect of another

Answer

Confounding occurs in fractional factorial designs when the effects of two or more factors or interactions are aliased, making it impossible to distinguish their individual contributions.

Lean Six Sigma Green Belt Certification Practice Test

Lean Six Sigma Green Belt Certification Practice Test

Lean Six Sigma Green Belt Certification DMAIC: Improve and Control 2