Lean Six Sigma Black Belt Certification Lean Six Sigma Black Belt Certification-FREE Lean Six Sigma Black Belt Certification 1

Question 1

Which tool is used in the Measure phase to visually display the frequency distribution of a continuous data set?

Accepted Answer

Histogram

Answer

A histogram displays the distribution of continuous data across intervals, making it the primary tool in the Measure phase for understanding data shape, spread, and central tendency before moving to analysis.

Question 2

What is the primary objective of a Gage R&R study in Lean Six Sigma?

Accepted Answer

To evaluate the measurement system's repeatability and reproducibility

Answer

Gage R&R (Repeatability and Reproducibility) quantifies variation contributed by the measurement system itself — separating equipment variation from operator variation — to confirm the measurement system is reliable before collecting process data.

Question 3

In hypothesis testing, a Type II error occurs when:

Accepted Answer

The null hypothesis is accepted when it is actually false

Answer

A Type II error (also called a false negative or beta error) occurs when the null hypothesis is incorrectly retained even though the alternative hypothesis is true — meaning a real effect goes undetected.

Question 4

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 (JIT) is a core Lean principle aimed at eliminating overproduction waste by synchronizing production flow with actual customer demand, reducing inventory and lead time.

Question 5

What does a Cp value of 1.0 indicate about a process?

Accepted Answer

The process spread exactly matches the specification width, with no margin for error

Answer

Cp measures the ratio of the specification width to the process spread (6 sigma). A Cp of 1.0 means the process spread exactly fills the specification limits, leaving zero tolerance for centering shifts — a marginally capable process.

Lean Six Sigma Black Belt Certification Practice Test

Lean Six Sigma Black Belt Certification Practice Test

Lean Six Sigma Black Belt Certification Lean Six Sigma Black Belt Certification-FREE Lean Six Sigma Black Belt Certification 1