Analyze Phase Tools 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 Analyze Phase Tools flashcards as text
What is the primary goal of a 5 Whys analysis in the Analyze phase?
Answer: To drill down from a symptom to its underlying root cause through iterative questioning
The 5 Whys technique repeatedly asks 'why' to move past symptoms and surface the true root cause of a problem.
A team runs a normality test (Anderson-Darling) and gets p = 0.023. At α = 0.05, what should the team conclude?
Answer: The data is not normally distributed; consider non-parametric methods or transformations
Since p (0.023) < α (0.05), the null hypothesis of normality is rejected, indicating the data does not follow a normal distribution.
In a value stream map used during the Analyze phase, what does the 'push' arrow symbol indicate?
Answer: Material or information pushed to the next step regardless of downstream needs
A push arrow in a VSM represents material being moved to the next process step based on a schedule or upstream production, not actual demand.
Which regression diagnostic plot should a Green Belt examine to check whether residuals are randomly distributed (a key regression assumption)?
Answer: Normal probability plot of residuals
The normal probability plot (or residuals vs. fitted values plot) checks whether residuals are randomly and normally distributed around zero.
A Green Belt wants to confirm that a suspected root cause actually explains the defects, not just correlates with them. Which approach best supports causal inference in the Analyze phase?
Answer: Validate the cause-effect relationship through a controlled experiment or stratified data analysis
Correlation alone does not establish causation; a controlled experiment or stratified analysis where the suspected X is deliberately varied provides causal evidence.
A team applies the SIPOC in the Analyze phase to trace a defect. Which element of SIPOC is most useful for identifying the source of a faulty input?
Answer: Supplier
The Supplier element identifies who or what provides each input, making it the starting point for tracing faulty inputs to their origin.
When using a Pugh concept selection matrix during the Analyze phase, what does a datum (baseline) represent?
Answer: The current process or reference concept against which alternatives are compared
The datum is a reference point (usually the current state or a known benchmark) used to rate all alternative concepts as better (+), worse (−), or same (S).