Lean Six Sigma Green Belt Certification Improve Phase and Solutions 3

Question 1

What is a 'fractional factorial' design used for in DOE?

Accepted Answer

To study a subset of all possible factor combinations and reduce runs

Answer

Fractional factorial designs study a carefully chosen fraction of all factor combinations, reducing runs while still estimating main effects.

Question 2

A 5S implementation is underway. Which 'S' focuses on creating rules and schedules to maintain the improved workplace?

Accepted Answer

Standardize

Answer

Standardize (the 4th S) involves creating standards, procedures, and schedules that sustain the gains from the first three S activities.

Question 3

In a single-minute exchange of die (SMED) initiative, 'external setup' activities are those that:

Accepted Answer

Can only be done while the machine is running

Answer

External setup activities can be performed while the machine is still running, unlike internal activities that require the machine to be stopped.

Question 4

Which statistical test is most appropriate to compare the means of three or more groups in an Improve phase validation?

Accepted Answer

One-way ANOVA

Answer

One-way ANOVA tests whether the means of three or more independent groups are statistically different.

Question 5

A kaizen event is best described as:

Accepted Answer

A focused, short-duration team workshop to rapidly improve a specific process

Answer

A kaizen event (or kaizen blitz) is an intensive, short-duration team effort—typically 3–5 days—to rapidly improve a targeted process area.

Lean Six Sigma Green Belt Certification Practice Test