FREE Certified Six Sigma Green Belt Questions and Answers 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.
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What is the key difference between common cause variation and special cause variation?
Answer: Common cause variation is inherent to the process while special cause variation results from assignable, unusual factors
Common cause variation is the natural, predictable variation built into a process, while special cause variation stems from identifiable, unusual sources that are not part of normal operations.
In a cause-and-effect (Ishikawa) diagram, which of the following is a standard category used to classify potential causes?
Answer: Measurement
The standard 6M categories in an Ishikawa diagram are Man, Machine, Method, Material, Measurement, and Mother Nature (Environment).
What does the rolled throughput yield (RTY) measure?
Answer: The probability that a unit passes through all process steps without any defect or rework
RTY is the product of first-pass yields at each process step, revealing the true probability of producing a defect-free unit through the entire process.
Which statistical test is most appropriate for comparing the means of more than two groups?
Answer: Analysis of Variance (ANOVA)
ANOVA tests whether there are statistically significant differences among the means of three or more independent groups.
What is the main objective of a Measurement System Analysis (MSA)?
Answer: To evaluate the accuracy and precision of the measurement system itself
MSA assesses whether the measurement system contributes acceptable levels of variation through studies of repeatability, reproducibility, bias, linearity, and stability.
In Lean Six Sigma, what does the term 'muda' specifically refer to?
Answer: Any activity that consumes resources but creates no value for the customer
Muda is the Japanese term for waste, referring to any non-value-added activity such as overproduction, waiting, transport, overprocessing, inventory, motion, and defects.