Lean Six Sigma Green Belt Certification Analyze Phase Tools 4

Question 1

A Green Belt performs a one-way ANOVA and obtains an F-statistic with p = 0.001. What is the correct interpretation?

Accepted Answer

At least one group mean is significantly different from the others

Answer

A significant ANOVA F-test indicates that at least one group mean differs, but does not specify which groups differ.

Question 2

What does a 'spaghetti diagram' reveal in the Analyze phase?

Accepted Answer

The physical flow path of people, materials, or products through a workspace

Answer

A spaghetti diagram traces actual movement paths in a physical layout to identify inefficient travel, backtracking, and waste.

Question 3

When using a cause-and-effect matrix, what are the rows and columns typically represent?

Accepted Answer

Rows = process inputs (Xs), Columns = key process outputs (Ys)

Answer

The C&E matrix rates each input (X) against each output (Y), helping prioritize which inputs most impact critical outputs.

Question 4

A Lean Six Sigma team finds that 20% of the product types account for 78% of customer complaints. Which tool was used to identify this insight?

Accepted Answer

Pareto chart

Answer

A Pareto chart ranks categories by frequency or impact, making it easy to identify the 'vital few' causes following the 80/20 principle.

Question 5

In a designed experiment, what is a 'confounded' effect?

Accepted Answer

Two or more effects that cannot be separately estimated because they are aliased

Answer

Confounding (aliasing) occurs when two effects are mathematically indistinguishable from each other in a fractional factorial design.

Lean Six Sigma Green Belt Certification Practice Test