Certified Six Sigma Black Belt Exam Free Certified Six Sigma Black Belt MCQ Questions and Answers 3

Question 1

During the Control phase, a Black Belt needs to monitor both the process mean and variability simultaneously. Which control chart combination should be used for subgroup sizes of 5?

Accepted Answer

X-bar and R chart

Answer

I-MR chart

Answer

P chart and U chart

Answer

CUSUM and EWMA chart

Question 2

In Design of Experiments (DOE), what is the primary advantage of a fractional factorial design over a full factorial design?

Accepted Answer

It requires fewer experimental runs while still estimating main effects

Answer

It provides more precise estimates of all interaction effects

Answer

It eliminates the need for randomization

Answer

It guarantees detection of all significant factors

Question 3

A process has a defect rate of 3,400 DPMO. What is the approximate sigma level of this process?

Accepted Answer

4.0 sigma

Answer

3.0 sigma

Answer

3.5 sigma

Answer

4.5 sigma

Question 4

Which tool is used in the Analyze phase to identify the vital few factors from the trivial many?

Accepted Answer

Pareto chart

Answer

Run chart

Answer

Histogram

Answer

Box plot

Question 5

What is the purpose of a tollgate review in the DMAIC methodology?

Accepted Answer

To formally evaluate whether a phase's deliverables are complete before moving to the next phase

Answer

To assign financial savings to the project

Answer

To present final results to senior leadership

Answer

To conduct a lessons-learned session with the project team

Question 6

In hypothesis testing, what does a Type II error represent in a Six Sigma context?

Accepted Answer

Failing to reject the null hypothesis when it is actually false

Answer

Rejecting the null hypothesis when it is actually true

Answer

Selecting the wrong statistical test for the data

Answer

Using an insufficient sample size for the analysis