Lean Six Sigma Green Belt Certification DMAIC: Measure Phase Tools 4

Question 1

When performing a capability study, a practitioner finds the data is right-skewed. What is the BEST next step before calculating Cp and Cpk?

Accepted Answer

Transform the data or use non-normal capability analysis methods

Answer

Standard Cp and Cpk formulas assume normality; skewed data requires transformation (e.g., Box-Cox) or non-normal capability methods to avoid misleading results.

Question 2

In a value stream map created during the Measure phase, 'push' production is characterized by:

Accepted Answer

Producing based on a schedule or forecast regardless of downstream demand

Answer

Push systems produce based on schedules or forecasts and send output downstream whether or not it is needed, often creating excess inventory (waste).

Question 3

A Green Belt calculates process cycle efficiency (PCE) as 12%. This means:

Accepted Answer

Only 12% of total lead time adds value from the customer's perspective

Answer

PCE = Value-Added Time / Total Lead Time; a 12% PCE means 88% of the time the product spends in the process is non-value-added (waste).

Question 4

Which data collection tool uses a grid to tally how often different types of defects occur, enabling pattern recognition by defect type and location?

Accepted Answer

Check sheet

Answer

A check sheet is a structured form used to collect and organize data about defect types, locations, or frequencies in real time at the source.

Question 5

A measurement system shows high repeatability variation. Which action would most directly address this?

Accepted Answer

Recalibrate the instrument or investigate instrument condition

Answer

Repeatability variation (same appraiser, same part, same instrument varies) typically points to the instrument itself — calibration, wear, or inconsistency in the gauge.

Lean Six Sigma Green Belt Certification Practice Test

Lean Six Sigma Green Belt Certification Practice Test

Lean Six Sigma Green Belt Certification DMAIC: Measure Phase Tools 4