Certified Six Sigma Black Belt Exam Basic 5

Question 1

The 'Control' phase of DMAIC primarily uses which tool to sustain improvements after project completion?

Accepted Answer

Control plan and control charts

Answer

A control plan documents the monitoring approach, and control charts provide ongoing statistical signals to maintain process gains after the project is closed.

Question 2

What is 'sigma shift' and why is it used in Six Sigma calculations?

Accepted Answer

A 1.5-sigma adjustment added to account for long-term process drift

Answer

A 1.5-sigma shift is added to short-term sigma calculations to account for typical long-term process drift and mean shifts, making the DPMO tables more realistic.

Question 3

Which of the following is an example of a 'common cause' variation in a process?

Accepted Answer

Random fluctuations inherent to the process operating normally

Answer

Common cause variation is the natural, inherent random variation always present in a stable process — it can only be reduced by changing the process system.

Question 4

What statistical tool is used to quantify the strength and direction of the linear relationship between two continuous variables?

Accepted Answer

Pearson correlation coefficient

Answer

The Pearson correlation coefficient (r) ranges from -1 to +1 and measures both the strength and direction of the linear relationship between two continuous variables.

Question 5

In the context of Six Sigma project selection, a 'Business Case' should include:

Accepted Answer

The financial impact and strategic alignment of the project

Answer

A Business Case articulates why the project matters by linking it to financial impact, cost of poor quality, and strategic business objectives to justify resources.

Certified Six Sigma Black Belt Exam Practice Test

Certified Six Sigma Black Belt Exam Practice Test

Certified Six Sigma Black Belt Exam Basic 5