Lean Six Sigma Green Belt Certification Analyze Phase Tools 2

Question 1

A Green Belt notices that defects spike every Monday morning on the assembly line. Which Analyze phase tool best captures this time-based pattern?

Accepted Answer

Control chart

Answer

Control charts plot data over time and reveal periodic patterns such as day-of-week effects.

Question 2

Which statistical test should a Green Belt use to determine whether the mean output of Machine A is significantly different from Machine B?

Accepted Answer

Two-sample t-test

Answer

A two-sample t-test compares the means of two independent groups to determine statistical significance.

Question 3

In a regression model for predicting cycle time, the R-squared value is 0.82. What does this indicate?

Accepted Answer

82% of the variation in cycle time is explained by the predictors

Answer

R-squared represents the proportion of variance in the response variable explained by the predictor variables.

Question 4

A team uses a fault tree analysis (FTA) during the Analyze phase. What is the primary purpose of FTA?

Accepted Answer

To map the logical chain of causes leading to a top-level failure event

Answer

Fault tree analysis uses Boolean logic to trace how combinations of lower-level events can cause a top-level failure.

Question 5

When would a Green Belt prefer a non-parametric test over a parametric test during data analysis?

Accepted Answer

When data is non-normal or the sample size is very small

Answer

Non-parametric tests make no distribution assumptions, making them appropriate for non-normal data or very small samples.

Lean Six Sigma Green Belt Certification Practice Test