Certified Six Sigma Black Belt Exam Free Certified Six Sigma Black Belt Practice Questions and Answers 2

Question 1

A Black Belt discovers that a critical process metric follows a non-normal distribution. Which tool is most appropriate for determining process capability?

Accepted Answer

Non-normal capability analysis using Weibull or other fitted distribution

Answer

Box-Cox transformation followed by normal capability analysis

Answer

Johnson transformation

Answer

Ignoring non-normality and using standard Cp/Cpk calculations

Question 2

During the Analyze phase, a team identifies multiple potential root causes. Which technique best helps prioritize these causes based on both probability and impact?

Accepted Answer

Failure Mode and Effects Analysis (FMEA)

Answer

Pareto chart

Answer

Fishbone diagram

Answer

5 Whys analysis

Question 3

What is the primary purpose of a Gage R&R study in a Six Sigma project?

Accepted Answer

To assess the variation contributed by the measurement system relative to total process variation

Answer

To calibrate measurement instruments to national standards

Answer

To determine the accuracy of a single measurement device

Answer

To validate that operators are following standard work procedures

Question 4

A Black Belt is designing an experiment with 5 factors, each at 2 levels, but resources allow only 8 runs. Which design is most appropriate?

Accepted Answer

2^(5-2) fractional factorial design

Answer

Full factorial design

Answer

Central composite design

Answer

Plackett-Burman design with 12 runs

Question 5

In a hypothesis test comparing two population means, a Black Belt obtains a p-value of 0.03 with alpha set at 0.05. The practical significance is negligible. What should the Black Belt conclude?

Accepted Answer

Report statistical significance but recommend no action due to lack of practical significance

Answer

Reject the null hypothesis and implement changes immediately

Answer

Fail to reject the null hypothesis since practical significance is absent

Answer

Increase the sample size to confirm the result

Question 6

Which of the following best describes the purpose of a control plan in the Control phase?

Accepted Answer

To provide a living document that specifies monitoring methods, reaction plans, and responsibilities for sustaining improvements

Answer

To document the statistical tests used during the Analyze phase

Answer

To create a project charter for the next DMAIC cycle

Answer

To train all employees on Six Sigma methodology