Certified Six Sigma Black Belt Exam Certified Six Sigma Black Belt MCQ 3

Question 1

A Black Belt calculates a p-value of 0.03 for a hypothesis test with α = 0.05. What is the correct conclusion?

Accepted Answer

Reject H0 because p < α

Answer

Since p = 0.03 < α = 0.05, there is sufficient evidence to reject the null hypothesis.

Question 2

Which lean concept focuses on producing only what is needed, when it is needed, and in the amount needed?

Accepted Answer

Just-In-Time (JIT)

Answer

Just-In-Time is a core Toyota Production System principle that minimizes inventory by producing to demand.

Question 3

When performing a multiple regression analysis, the variance inflation factor (VIF) is used to detect:

Accepted Answer

Multicollinearity

Answer

VIF measures how much the variance of a regression coefficient is inflated due to multicollinearity among predictors.

Question 4

In a reliability context, what does MTTF stand for and when is it used?

Accepted Answer

Mean Time To Failure — for non-repairable systems

Answer

MTTF (Mean Time To Failure) is the average time a non-repairable item operates before failing.

Question 5

A fishbone (Ishikawa) diagram is MOST useful during which DMAIC phase?

Accepted Answer

Analyze

Answer

The fishbone diagram is used in the Analyze phase to systematically identify potential root causes of a problem.

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