FREE Lean Six Sigma Green Belt Analyze Phase Root Cause Questions and Answers

Question 1

A Lean Six Sigma Green Belt team is investigating high defect rates in a manufacturing process.
After extensively mapping the process and collecting data, they suspect that a specific machine setting is contributing to the defects.
To visually represent the potential relationship between the machine setting (a continuous variable) and the number of defects (a count), which Analyze Phase tool would be most appropriate for initial exploration?

Accepted Answer

Scatter Plot

Answer

Pareto Chart

Answer

Control Chart

Answer

Fishbone Diagram

Question 2

During the Analyze Phase, a project team has identified several potential root causes for customer service call duration variability. To narrow down these potential causes and prioritize them based on their likely impact, which tool would be most effective for a team brainstorming session followed by a structured voting process?

Accepted Answer

Cause and Effect Matrix

Answer

5 Whys Analysis

Answer

FMEA (Failure Mode and Effects Analysis)

Answer

Multi-Vari Chart

Question 3

Which of the following scenarios best illustrates the application of a 5 Whys analysis in the Analyze Phase?

Accepted Answer

A team is sequentially asking 'why' a problem occurred to drill down to the underlying systemic root cause.

Answer

A team is statistically testing whether two different process settings result in significantly different average defect rates.

Answer

A team is creating a visual representation of all possible factors that could contribute to a problem, categorized by major areas.

Answer

A team is plotting data points over time to monitor process stability and detect special cause variation.

Question 4

A Green Belt project aims to reduce the number of errors in data entry. After collecting data on different types of errors, the team wants to identify the vital few errors that account for the majority of the problem. Which graphical tool is best suited for this purpose in the Analyze Phase?

Accepted Answer

Pareto Chart

Answer

Run Chart

Answer

Histogram

Answer

Box Plot

Question 5

After conducting a Fishbone Diagram session, a Lean Six Sigma team has identified numerous potential causes for a persistent production delay. To move from potential causes to verified root causes, what is the crucial next step in the Analyze Phase?

Accepted Answer

Begin collecting more data on the potential causes to validate their impact.

Answer

Immediately implement solutions for all identified causes.

Answer

Redraw the Fishbone Diagram with more detail.

Answer

Present the Fishbone Diagram directly to the project sponsor for approval.

Question 6

What is the primary objective of the Analyze Phase in a Lean Six Sigma project?

Accepted Answer

To identify and validate the root causes of the problem.

Answer

To define the project scope, objectives, and deliverables.

Answer

To implement and verify the effectiveness of improvement solutions.

Answer

To establish a baseline for the current process performance.