Knowledge Flashcards
7 cards from real Lean Six Sigma Green Belt Certification practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Knowledge flashcards as text
Which control chart is most appropriate for monitoring individual measurements when subgroup sizes equal 1?
Answer: Individuals and Moving Range (I-MR) chart
The I-MR chart monitors individual data points and uses moving ranges between consecutive points to estimate process variation when only one measurement is taken at a time.
A project charter defines the problem statement, scope, goals, and team. Which element is most critical to include to ensure project boundaries are respected?
Answer: Scope statement
The scope statement explicitly defines what is included and excluded from the project, preventing scope creep and keeping the team focused on the right problem.
In a cause-and-effect (fishbone) diagram, the 'bones' typically represent which categories?
Answer: Man, Machine, Method, Material, Measurement, Environment
The 6M categories (Man, Machine, Method, Material, Measurement, Environment) form the main branches of a fishbone diagram to systematically explore root causes.
What is the primary goal of a control plan in the Control phase of DMAIC?
Answer: To provide a roadmap for sustaining process improvements after the project closes
A control plan specifies the monitoring methods, response plans, and responsibilities needed to sustain improvements and prevent reversion to old process behavior.
When conducting a multi-vari study, the Green Belt is looking to understand:
Answer: The sources and patterns of variation (positional, cyclical, temporal)
Multi-vari charts graphically display three families of variation — positional, cyclical, and temporal — to narrow down which family contributes most to the observed variation.
A Green Belt wants to test whether a process improvement changed the defect rate. Which test is most appropriate for comparing two proportions?
Answer: Two-proportion z-test
The two-proportion z-test determines whether there is a statistically significant difference between two independent proportions, such as defect rates before and after improvement.
In Lean, the 'spaghetti diagram' is used primarily to:
Answer: Visualize the physical movement of people or materials through a workspace
A spaghetti diagram traces the actual physical path traveled by a person, product, or material, revealing excessive motion waste and layout inefficiencies.