Certified Six Sigma Black Belt Exam FREE Certified Six Sigma Black Belt Basic Questions and Answers 3

Question 1

What is the significance of the term 'sigma level' when a process operates at 6 sigma with a 1.5 sigma shift?

Accepted Answer

The process produces 3.4 defects per million opportunities

Answer

At 6 sigma with the standard 1.5 sigma long-term shift, the process yields 3.4 defects per million opportunities (DPMO).

Question 2

Which statistical test is most appropriate for comparing means of three or more groups?

Accepted Answer

Analysis of Variance (ANOVA)

Answer

ANOVA tests whether statistically significant differences exist among the means of three or more independent groups.

Question 3

In a control chart, what condition indicates a process is out of statistical control?

Accepted Answer

A single point beyond the upper or lower control limit

Answer

A point beyond either control limit is one of the Western Electric rules indicating the process has shifted out of statistical control.

Question 4

What is the main objective of the Control phase in DMAIC?

Accepted Answer

Sustaining improvements and monitoring the process over time

Answer

The Control phase focuses on implementing control plans, monitoring systems, and response plans to ensure improvements are sustained long-term.

Question 5

Which lean tool uses a visual board to limit work-in-progress and improve flow?

Accepted Answer

Kanban

Answer

Kanban uses visual cards and WIP limits on a board to regulate workflow, reduce overproduction, and improve process flow.

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