Lean Six Sigma Yellow Belt Certification The Analyze Phase 4

Question 1

What is the difference between 'common cause' and 'special cause' variation?

Accepted Answer

Common cause is inherent to the process; special cause is due to specific, assignable factors

Answer

Common cause variation is the normal, random variation within a stable process, while special cause variation results from specific, identifiable factors outside the normal system.

Question 2

Which of the following is an example of non-value-added but necessary (NVAN) work?

Accepted Answer

Regulatory compliance reporting required by law

Answer

NVAN activities do not add value from the customer's perspective but are required due to regulatory, legal, or business constraints.

Question 3

A team maps their process and finds steps where partially finished work sits idle awaiting the next operation. Which type of waste does this represent?

Accepted Answer

Inventory

Answer

Inventory waste (also called 'work in progress' or WIP) occurs when partially finished goods or services accumulate between process steps.

Question 4

During the Analyze phase, a team uses a box plot. What does the line inside the box represent?

Accepted Answer

The median (50th percentile)

Answer

In a box plot, the line inside the box represents the median, which divides the dataset so that half the values fall above and half below.

Question 5

Which Six Sigma concept measures the number of standard deviations between the process mean and the nearest specification limit?

Accepted Answer

Sigma level (Z-score)

Answer

The sigma level (or Z-score) measures how many standard deviations the process mean is from the specification limit, indicating process capability.

Lean Six Sigma Yellow Belt Certification Practice Test

Lean Six Sigma Yellow Belt Certification Practice Test

Lean Six Sigma Yellow Belt Certification The Analyze Phase 4