Prep Flashcards
7 cards from real Lean Six Sigma Yellow 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 Prep flashcards as text
A process produces 20 defects per 1,000 opportunities. What is the DPMO?
Answer: 20,000
DPMO = (defects / opportunities) × 1,000,000 = (20/1,000) × 1,000,000 = 20,000 DPMO.
Which of the following best describes 'poka-yoke'?
Answer: An error-proofing mechanism that prevents or detects defects
Poka-yoke refers to any mistake-proofing device or method designed to prevent errors or make defects immediately obvious.
What is the purpose of a Measurement System Analysis (MSA)?
Answer: To assess whether the measurement system introduces significant variation into the data
MSA (often a Gage R&R study) evaluates how much of the observed variation comes from the measurement system itself versus the actual process.
In Lean thinking, 'overproduction' is considered waste because:
Answer: It produces more than the customer currently needs, consuming resources and creating inventory
Overproduction is the worst Lean waste as it drives all other wastes — excess inventory, extra transportation, unnecessary motion, and storage costs.
A Yellow Belt notices a process step takes 45 minutes but only 5 minutes of that adds value to the customer. What Lean metric captures this ratio?
Answer: Process cycle efficiency (PCE)
Process Cycle Efficiency = Value-Added Time / Total Lead Time; here PCE = 5/45 ≈ 11%, indicating significant waste.
The 'voice of the customer' (VOC) is used in Six Sigma primarily to:
Answer: Identify and prioritize customer needs that drive Critical to Quality (CTQ) characteristics
VOC captures customer requirements and expectations, which are then translated into measurable CTQ characteristics that guide the improvement project.
Which type of data is counted rather than measured on a continuous scale?
Answer: Attribute (discrete) data
Attribute or discrete data represents counts or categories (e.g., number of defects, pass/fail), while variable data is measured on a continuous scale.