Lean Six Sigma Yellow Belt Certification The Measure Phase 5

Question 1

Which data collection technique involves observing the actual process in real time rather than relying on historical records?

Accepted Answer

Direct observation (gemba)

Answer

Direct observation (going to the gemba, or actual workplace) captures what truly happens rather than what historical records or memory suggest.

Question 2

A check sheet is most useful in the Measure phase for:

Accepted Answer

Systematically collecting and tallying defect or event data in real time

Answer

A check sheet is a structured form for collecting and organizing data at the source, making tallying and pattern recognition easy.

Question 3

In a SIPOC diagram, what does the 'O' represent?

Accepted Answer

Outputs

Answer

In SIPOC (Suppliers, Inputs, Process, Outputs, Customers), 'O' stands for Outputs — the products, services, or information produced by the process.

Question 4

Which control chart is appropriate for monitoring the average and variation of a continuous measurement when subgroup size is 5?

Accepted Answer

X-bar and R chart

Answer

The X-bar and R chart monitors subgroup means (X-bar) and subgroup ranges (R) for continuous data with subgroup sizes typically between 2 and 10.

Question 5

What is the purpose of calculating 'rolled throughput yield' (RTY) in the Measure phase?

Accepted Answer

To measure the probability that a unit passes through all process steps without any defects

Answer

RTY is the product of first-pass yields at each process step, revealing the true probability a unit is completed defect-free without rework.

Lean Six Sigma Yellow Belt Certification Practice Test