Certified Six Sigma Black Belt Exam Practice 4

Question 1

A process is in statistical control but producing 15% defects. The appropriate response is to:

Accepted Answer

Redesign or fundamentally change the process

Answer

A stable but incapable process requires systemic improvement—adjusting inputs or redesigning the process—not just monitoring.

Question 2

Which tool maps the sequence of steps in a process and clearly shows both value-added and non-value-added activities?

Accepted Answer

Value stream map

Answer

Value stream mapping (VSM) documents material and information flow, identifying waste and non-value-added steps.

Question 3

In a 2-level full factorial DOE, an interaction effect between factors A and B means:

Accepted Answer

The effect of A on Y depends on the level of B

Answer

An interaction means the combined effect of A and B on the response is not simply additive—the level of one factor changes the effect of the other.

Question 4

A Black Belt calculates the p-value for a hypothesis test as 0.03 with α = 0.05. The correct conclusion is:

Accepted Answer

Reject H₀ because p < α

Answer

Since p-value (0.03) < α (0.05), there is sufficient evidence to reject the null hypothesis.

Question 5

The primary purpose of a SIPOC diagram in the Define phase is to:

Accepted Answer

Provide a high-level view of the process scope and stakeholders

Answer

SIPOC maps Suppliers, Inputs, Process steps, Outputs, and Customers to define process boundaries at a macro level.

Certified Six Sigma Black Belt Exam Practice Test