Lean Six Sigma Yellow Belt Certification Prep 4

Question 1

A team creates a fishbone (Ishikawa) diagram. Which of the following is NOT a standard category of causes used in manufacturing?

Accepted Answer

Customers

Answer

The standard 6M fishbone categories in manufacturing are: Man, Machine, Method, Material, Measurement, and Mother Nature (Environment) — not Customers.

Question 2

What does a control chart's Upper Control Limit (UCL) represent?

Accepted Answer

Three standard deviations above the process mean, indicating common cause variation boundaries

Answer

UCL is calculated as the mean plus 3 sigma (3 standard deviations) and represents the upper boundary of expected natural process variation.

Question 3

Which DMAIC phase focuses on identifying the root cause of the problem?

Accepted Answer

Analyze

Answer

The Analyze phase uses statistical and graphical tools to identify and verify the root causes driving the problem identified in Define and quantified in Measure.

Question 4

A team plots cycle time vs. batch size and finds a strong positive correlation. This analysis is best visualized using a:

Accepted Answer

Scatter diagram

Answer

A scatter diagram plots two variables against each other to visually reveal whether and how strongly they are correlated.

Question 5

In Lean, 'takt time' represents:

Accepted Answer

The rate at which customers demand products, calculated as available time divided by customer demand

Answer

Takt time = Available Production Time / Customer Demand; it sets the production rhythm needed to meet customer demand without overproducing.

Lean Six Sigma Yellow Belt Certification Practice Test

Lean Six Sigma Yellow Belt Certification Practice Test

Lean Six Sigma Yellow Belt Certification Prep 4