Free Lean Six Sigma Green Belt Knowledge Questions and Answers

Question 1

The "Funnel Effect" is the practice of narrowing the project team's attention to only one issue.

Accepted Answer

False

Answer

The 'Funnel Effect' in Lean Six Sigma refers to the process of starting with a broad problem statement and progressively narrowing its scope to a specific, measurable, and manageable project. It's about defining a clear project scope, not necessarily restricting the team's attention to 'only one' issue in a limiting sense. The statement implies a restrictive focus that doesn't fully capture the concept.

Question 2

When assessing a data set's dispersion, average moving range is the preferable statistic above standard deviation.

Accepted Answer

False

Answer

Standard deviation is generally the preferred and more robust statistic for measuring the dispersion or spread of a data set. While the average moving range can be used, especially in control charts for smaller subgroups, it is an estimate of variability and is less precise than the standard deviation, which directly calculates the average distance of data points from the mean. Therefore, standard deviation is typically considered superior for assessing overall dispersion.

Question 3

Is it true that the client specifies the standard deviations lines above and below the process data on control charts rather than the data's variation?

Accepted Answer

False

Answer

The control limits on a control chart (typically set at +/- 3 standard deviations from the mean) are calculated based on the inherent variation of the process data itself, not specified by the client. These limits reflect the expected natural variation of the process. While clients might specify desired performance targets or specification limits, these are distinct from the statistically derived control limits used to monitor process stability.

Question 4

By employing the same measuring tool or the same measuring procedure to measure the exact same characteristic of the same part or object, what is meant by repeatability? (Also called the "within" variation)

Accepted Answer

True

Answer

Repeatability, in Measurement System Analysis (MSA), specifically refers to the variation observed when the same operator uses the same measuring device to measure the same characteristic on the same part multiple times. It quantifies the inherent variability of the measurement device itself. This is often referred to as 'within' variation because it measures the consistency of a single operator and device.

Question 5

What does the C&E in a fishbone diagram stand for?

Accepted Answer

Cause and effect

Answer

A fishbone diagram, also known as an Ishikawa diagram, is a visual tool used in Lean Six Sigma for root cause analysis. The 'C&E' stands for 'Cause and Effect,' as the diagram systematically categorizes potential causes (the 'bones') that contribute to a specific problem or effect (the 'head' of the fish). It helps teams brainstorm and identify underlying reasons for issues.

Lean Six Sigma Green Belt Certification Practice Test

Lean Six Sigma Green Belt Certification Practice Test

Free Lean Six Sigma Green Belt Knowledge Questions and Answers