Lean Six Sigma Green Belt Certification Prep 3

Question 1

A Green Belt team discovers that 80% of defects come from 20% of the causes. Which tool best visualizes this finding?

Accepted Answer

Pareto chart

Answer

A Pareto chart visually displays the 80/20 rule by ranking causes from most to least frequent, helping teams prioritize improvement efforts.

Question 2

What is the sigma level of a process producing 3.4 defects per million opportunities (DPMO)?

Accepted Answer

6 sigma

Answer

Six Sigma quality is defined as 3.4 DPMO, which accounts for a 1.5 sigma long-term shift in the process mean.

Question 3

In a Design of Experiments (DOE), what is a 'main effect'?

Accepted Answer

The change in the response when a factor moves from its low to high level

Answer

A main effect is the average change in the output response attributable to moving a single factor from its low level to its high level.

Question 4

Which measurement system analysis (MSA) metric measures the proportion of total process variation that is due to measurement error?

Accepted Answer

%Gauge R&R

Answer

%Gauge R&R expresses measurement system variation as a percentage of total process variation, with values below 10% generally considered acceptable.

Question 5

What is 'Takt time' in Lean manufacturing?

Accepted Answer

The available production time divided by customer demand rate

Answer

Takt time is the rate at which products must be produced to match customer demand, calculated as available production time divided by demand volume.

Lean Six Sigma Green Belt Certification Practice Test