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

Pareto chart

Answer

Box plot analysis

Answer

Fishbone diagram

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

Accept the solution since variability improved

Answer

Restart DMAIC from the Define phase

Answer

Remove the pilot and revert to the original process

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

Warning poka-yoke

Answer

Control poka-yoke

Answer

Prediction poka-yoke

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

Recalculate control limits using a larger subgroup size

Answer

Switch from an X-bar R chart to an individuals chart

Answer

Increase sampling frequency

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

Two factors are set at the same level across all runs

Answer

Experimental error exceeds the main effect size

Answer

The center points differ significantly from factorial points

Question 6

What is the primary purpose of a pre-control chart in the Control phase?

Accepted Answer

To provide a simple, specification-based method for operators to detect process shifts

Answer

To replace the control plan after process stabilization

Answer

To calculate Cpk in real time

Answer

To identify special causes by comparing to historical baselines

Question 7

A team completes the Improve phase and hands off to operations. Which document is most critical to ensure the improvement is sustained?

Accepted Answer

Control plan

Answer

Project charter

Answer

SIPOC diagram

Answer

Value stream map

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

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Sources & references