Lean Six Sigma Green Belt Certification Control Phase and Sustainment 5

Question 1

What is the MAIN risk of setting control limits too wide on an X-bar chart?

Accepted Answer

Real process shifts may not be detected until many defects are produced

Answer

Overly wide control limits reduce the chart's sensitivity, meaning actual process deterioration may go undetected for an extended period, increasing defect output.

Question 2

Which metric is MOST appropriate for tracking long-term process capability in the Control phase?

Accepted Answer

Cpk (process capability index)

Answer

Cpk measures ongoing process capability relative to specifications while accounting for process centering, making it the standard metric for monitoring sustained capability.

Question 3

An I-MR chart is used instead of an X-bar and R chart when:

Accepted Answer

Only one measurement per time period is practical or available

Answer

Individuals and Moving Range (I-MR) charts are designed for situations where subgroup sampling is not feasible and only a single observation is available per time period.

Question 4

A project benefit realization review is typically conducted to:

Accepted Answer

Confirm that the financial savings projected during the project were actually achieved

Answer

A benefit realization review validates that the anticipated financial and operational benefits (savings, quality improvements) actually occurred after project implementation.

Question 5

In a control plan, the 'reaction plan' column is triggered when:

Accepted Answer

A measurement exceeds the control limit or action threshold

Answer

The reaction plan activates when a control measurement signals an out-of-control or out-of-specification condition, providing a predefined escalation and correction sequence.

Lean Six Sigma Green Belt Certification Practice Test

Lean Six Sigma Green Belt Certification Practice Test

Lean Six Sigma Green Belt Certification Control Phase and Sustainment 5