Lean Six Sigma Black Belt Certification 1 Flashcards
6 cards from real Lean Six Sigma Black 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 Lean Six Sigma Black Belt Certification 1 flashcards as text
In a full factorial Design of Experiments (DOE) with 4 factors each at 2 levels, how many experimental runs are required?
Answer: 16
A full factorial DOE with k factors at 2 levels requires 2^k runs. With 4 factors: 2^4 = 16 runs. This ensures all combinations of factor levels are tested, allowing estimation of all main effects and interactions.
A Gauge R&R study reports that the %Study Variation attributable to the measurement system is 28%. According to AIAG guidelines, how should this result be classified?
Answer: Marginal — may be acceptable depending on the application and cost of improvement
AIAG MSA guidelines classify measurement systems as: 30% = unacceptable. At 28%, the system is marginal and judgment is required before relying on it.
What is the consequence of committing a Type II error (β error) in hypothesis testing during a DMAIC Analyze phase?
Answer: Failing to detect a real effect and concluding no significant relationship exists
A Type II (beta) error occurs when you fail to reject a false null hypothesis — you miss a real effect. In DMAIC, this means concluding an X variable has no significant impact when it actually does, causing the true root cause to be overlooked.
In Value Stream Mapping, Process Cycle Efficiency (PCE) is calculated as:
Answer: Value-added time divided by total lead time
PCE = Value-Added Time / Total Lead Time. A PCE below 25% typically signals a significant lean improvement opportunity. It quantifies how much of the total time a product spends in the value stream actually transforms it into something the customer pays for.
A Black Belt is monitoring the count of defects per unit on a line where the number of units inspected per shift varies. Which control chart is most appropriate?
Answer: u-chart
The u-chart tracks defects per unit when subgroup size varies. The c-chart also monitors defect counts but requires a constant subgroup size. The p-chart and np-chart track the proportion or number of defective units (pass/fail), not the count of individual defects.
In the Kano model, which category describes product features that customers consider baseline requirements and whose absence causes extreme dissatisfaction, even though their presence does not increase satisfaction?
Answer: Must-be (Basic needs)
Must-be attributes are assumed by customers — they expect them without articulating them. Failing to provide them drives strong dissatisfaction, but fulfilling them simply meets the minimum bar and does not delight. Examples include a car that starts reliably or a hotel room that is clean.