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
A Green Belt calculates a process sigma level of 4.5. Approximately what is the defects per million opportunities (DPMO)?
Answer: 233 DPMO
A process at 4.5 sigma corresponds to approximately 233 DPMO, well below the 6-sigma target of 3.4 DPMO.
Which tool is used to prioritize potential failure modes by evaluating severity, occurrence, and detectability?
Answer: FMEA
Failure Mode and Effects Analysis (FMEA) uses a Risk Priority Number (RPN = Severity × Occurrence × Detection) to rank and prioritize risks.
In a value stream map, what does a 'push' arrow symbol indicate?
Answer: Material pushed to the next step regardless of need
A push arrow shows that material is moved to the next process based on a schedule or batch, not on actual downstream demand.
The Kano model classifies customer requirements into three main categories. Which category represents features customers expect as basic, causing dissatisfaction if absent?
Answer: Basic needs (Must-be)
Basic (Must-be) needs are taken for granted; their absence causes strong dissatisfaction, but their presence does not increase satisfaction.
What does the term 'takt time' represent in Lean manufacturing?
Answer: The rate of customer demand expressed as available time divided by demand
Takt time = available production time ÷ customer demand rate, setting the pace production must match to meet demand without overproduction.
Which statistical test is most appropriate for comparing the means of two independent groups when data is normally distributed?
Answer: Two-sample t-test
The two-sample t-test compares means of two independent, normally distributed populations to determine if a statistically significant difference exists.
A control chart shows a run of 8 consecutive points on one side of the centerline. This pattern indicates:
Answer: A special cause requiring investigation
Eight or more consecutive points on one side of the centerline is a Western Electric rule violation signaling a special cause shift in the process mean.