Lean Six Sigma Green Belt Certification Lean Six Sigma Green Belt 1

Question 1

What is the primary objective of the Analyze phase in DMAIC?

Accepted Answer

Identify and verify the root causes of the problem

Answer

The Analyze phase focuses on using data and analytical tools (such as fishbone diagrams, regression, and hypothesis testing) to identify and statistically verify the true root causes of the problem before moving to solutions.

Question 2

Which process capability index accounts for BOTH process spread and process centering relative to specification limits?

Accepted Answer

Cpk

Answer

Cpk adjusts for how well the process mean is centered between the specification limits, making it a more complete measure than Cp, which only considers spread. A process can have a high Cp but a low Cpk if it is off-center.

Question 3

In Lean methodology, which of the following best describes the waste of 'Overproduction'?

Accepted Answer

Producing more output than the customer currently needs

Answer

Overproduction—making more than is needed, sooner than needed—is considered the worst of the eight Lean wastes because it generates or hides most of the other wastes such as inventory, transportation, and defects.

Question 4

A Fishbone (Ishikawa) diagram is primarily used to:

Accepted Answer

Organize and display potential root causes grouped by category

Answer

The Fishbone diagram structures brainstormed potential causes into categories (e.g., Man, Machine, Method, Material, Measurement, Environment), helping teams systematically explore why a problem exists without jumping to solutions.

Question 5

In hypothesis testing, if the p-value is 0.03 and the significance level (α) is 0.05, the correct conclusion is:

Accepted Answer

Reject the null hypothesis; the result is statistically significant

Answer

When the p-value (0.03) is less than α (0.05), there is sufficient statistical evidence to reject the null hypothesis. This means the observed effect is unlikely due to random chance at the chosen confidence level.

Lean Six Sigma Green Belt Certification Practice Test

Lean Six Sigma Green Belt Certification Practice Test

Lean Six Sigma Green Belt Certification Lean Six Sigma Green Belt 1