Lean Six Sigma Yellow Belt Certification Assessment 5

Question 1

During an assessment, a team discovers that operators interpret work instructions differently. Which type of variation does this represent?

Accepted Answer

Special cause variation

Answer

Different operator interpretations are assignable (special cause) variations that can be identified and eliminated, unlike random common cause variation.

Question 2

A process assessment reveals a defect rate of 3.4 DPMO. What sigma level does this correspond to?

Accepted Answer

6 Sigma

Answer

3.4 DPMO is the benchmark for Six Sigma performance, meaning nearly perfect quality with only 3.4 defects per million opportunities.

Question 3

What is the purpose of stratification in data collection during a Lean Six Sigma assessment?

Accepted Answer

To separate data into subgroups to identify patterns or differences between groups

Answer

Stratification breaks data into meaningful subgroups (by shift, machine, operator) so the team can pinpoint which subgroup is driving a problem.

Question 4

Which assessment activity involves team members observing the actual workplace to see waste and problems firsthand?

Accepted Answer

Gemba walk

Answer

A Gemba walk involves going to the actual place where work is done to observe processes directly, rather than relying solely on reports or data.

Question 5

A team assessing a call center process finds that average handle time has increased over the past month. Which chart would best confirm if this is a statistically significant shift?

Accepted Answer

Individuals (I-MR) control chart

Answer

An Individuals and Moving Range (I-MR) control chart plots time-ordered data with control limits, making it possible to detect statistically significant shifts or trends.

Lean Six Sigma Yellow Belt Certification Practice Test

Lean Six Sigma Yellow Belt Certification Practice Test

Lean Six Sigma Yellow Belt Certification Assessment 5