FREE Certified Six Sigma Black Belt Assessment Questions and Answers Flashcards
6 cards from real Certified Six Sigma Black Belt Exam practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
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A Black Belt calculates that a process produces 3.4 defects per million opportunities. What sigma level does this represent?
Answer: 6 sigma
A 6 sigma process with a 1.5 sigma shift produces 3.4 defects per million opportunities, which is the benchmark goal of Six Sigma methodology.
When conducting a Gage R&R study, the results show that the measurement system accounts for 35% of total observed variation. What action should the Black Belt take?
Answer: Improve the measurement system before collecting process data
A Gage R&R above 30% indicates the measurement system is unacceptable and must be improved before reliable process data can be collected.
Which statistical test should a Black Belt use to compare the means of three or more groups simultaneously?
Answer: ANOVA
Analysis of Variance (ANOVA) is designed to test whether there are statistically significant differences among the means of three or more independent groups.
In the Control phase, a Black Belt implements an X-bar and R chart. The X-bar chart shows a point beyond the upper control limit. What should be done first?
Answer: Investigate the assignable cause
An out-of-control signal requires immediate investigation to identify and address the assignable (special) cause of variation.
A Black Belt needs to prioritize which Critical-to-Quality (CTQ) characteristics to focus on. Which tool links customer requirements to measurable process outputs?
Answer: Quality Function Deployment (QFD)
QFD, often using a House of Quality matrix, systematically translates customer requirements (Voice of Customer) into measurable CTQ characteristics.
What is the key difference between common cause variation and special cause variation in a process?
Answer: Common cause variation is inherent to the process while special cause variation is due to identifiable external factors
Common cause variation is the natural, inherent variation within a stable process, while special cause variation results from identifiable, assignable factors that are not part of normal process behavior.