LSSGB 1 Flashcards
6 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 6 LSSGB 1 flashcards as text
When a data point falls outside the control limits on an X-bar control chart, this most likely indicates:
Answer: A special cause of variation has entered the process
Points outside control limits signal special (assignable) cause variation — an unusual event or shift not inherent to the process. Common cause variation, by definition, keeps points within the limits. The correct response is to investigate and eliminate the special cause before drawing conclusions about capability.
In Lean, 'takt time' is defined as:
Answer: The available production time divided by customer demand rate
Takt time (from German 'beat') sets the production pace required to meet customer demand. It is calculated as Available Production Time ÷ Customer Demand. It serves as the heartbeat that synchronizes process output to pull — not a measure of actual cycle time or lead time.
Which of the following is NOT one of the eight wastes in Lean manufacturing (DOWNTIME)?
Answer: Inspection
The 8 Lean wastes (DOWNTIME) are: Defects, Overproduction, Waiting, Non-utilized talent, Transportation, Inventory, Motion, and Extra-processing. Inspection is not a standalone named waste — though it may be a symptom of defects or over-processing, it does not appear as one of the eight categories.
In a Gauge R&R (Measurement System Analysis) study, 'Reproducibility' specifically quantifies:
Answer: Variation that arises when different operators measure the same part with the same gauge
Reproducibility captures operator-to-operator variation — how consistently different people obtain the same reading on the same part with the same instrument. Repeatability, by contrast, is instrument variation from a single operator. Distinguishing the two guides whether to address the tool or the people/training.
In inferential statistics, what is the correct interpretation when a Six Sigma team rejects the null hypothesis?
Answer: The sample data provides sufficient evidence that the null hypothesis is unlikely to be true
Rejecting the null hypothesis means the observed data would be very unlikely if H₀ were true (p ≤ alpha), so the team concludes there is sufficient statistical evidence against it. It does not 'prove' the alternative — it simply means H₀ is implausible given the data. Rejection occurs when p ≤ alpha, not p > alpha.
In Failure Mode and Effects Analysis (FMEA), the Risk Priority Number (RPN) is calculated by multiplying:
Answer: Severity, Occurrence, and Detection
RPN = Severity × Occurrence × Detection. Each factor is rated on a 1–10 scale. Severity measures impact if the failure occurs, Occurrence measures how frequently it might happen, and Detection measures how likely the current controls are to catch the failure before it reaches the customer. Higher RPN scores prioritize remediation efforts.