FREE Certified Six Sigma Black Belt Basic 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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What is the significance of the term 'sigma level' when a process operates at 6 sigma with a 1.5 sigma shift?
Answer: The process produces 3.4 defects per million opportunities
At 6 sigma with the standard 1.5 sigma long-term shift, the process yields 3.4 defects per million opportunities (DPMO).
Which statistical test is most appropriate for comparing means of three or more groups?
Answer: Analysis of Variance (ANOVA)
ANOVA tests whether statistically significant differences exist among the means of three or more independent groups.
In a control chart, what condition indicates a process is out of statistical control?
Answer: A single point beyond the upper or lower control limit
A point beyond either control limit is one of the Western Electric rules indicating the process has shifted out of statistical control.
What is the main objective of the Control phase in DMAIC?
Answer: Sustaining improvements and monitoring the process over time
The Control phase focuses on implementing control plans, monitoring systems, and response plans to ensure improvements are sustained long-term.
Which lean tool uses a visual board to limit work-in-progress and improve flow?
Answer: Kanban
Kanban uses visual cards and WIP limits on a board to regulate workflow, reduce overproduction, and improve process flow.
What does the correlation coefficient (r) value of -0.95 indicate about two variables?
Answer: A strong negative linear relationship
An r value of -0.95 indicates a very strong negative linear relationship, meaning as one variable increases, the other decreases proportionally.