Certified Six Sigma Black Belt Exam Process Capability Analysis 2

Question 1

Which prerequisite must be verified BEFORE conducting a process capability analysis?

Accepted Answer

The process must be in statistical control

Answer

Process capability analysis is only meaningful when the process is in statistical control, ensuring that variation is random, stable, and predictable over time.

Question 2

What does DPMO stand for in the context of Six Sigma process capability?

Accepted Answer

Defects Per Million Opportunities

Answer

DPMO (Defects Per Million Opportunities) normalizes defect rates to one million opportunities, enabling comparison across processes with different complexities.

Question 3

How many DPMO does a true Six Sigma process produce when accounting for the standard 1.5 sigma long-term shift?

Accepted Answer

3.4

Answer

With the 1.5 sigma long-term drift applied, a six sigma process produces 3.4 DPMO — the defining benchmark of Six Sigma quality.

Question 4

Which graphical tool is most appropriate for verifying the normality assumption before performing standard capability analysis?

Accepted Answer

Normal probability plot

Answer

A normal probability plot (or Anderson-Darling test) graphically assesses whether data follows a normal distribution, which is required for valid Cp and Cpk calculations.

Question 5

What happens to the Cpk value when the process mean shifts closer to a specification limit?

Accepted Answer

Cpk decreases because the distance to the nearest limit shrinks

Answer

Cpk uses the minimum distance from the mean to either specification limit; as the mean shifts toward a limit, that minimum distance shrinks, reducing Cpk.

Certified Six Sigma Black Belt Exam Practice Test

Certified Six Sigma Black Belt Exam Practice Test

Certified Six Sigma Black Belt Exam Process Capability Analysis 2