Lean Six Sigma Yellow Belt Certification Measure Phase Tools 4

Question 1

When a process has a Cpk value significantly lower than its Cp value, this indicates that the process:

Accepted Answer

Is not centered between the specification limits

Answer

Cpk accounts for process centering; a Cpk much lower than Cp signals the process mean is shifted toward one of the specification limits.

Question 2

Which of the following best describes 'common cause variation' in a process?

Accepted Answer

Random, inherent variation present in every stable process

Answer

Common cause variation is the natural, predictable noise in a stable process and can only be reduced by changing the process itself.

Question 3

A process map differs from a SIPOC because it:

Accepted Answer

Shows detailed, step-by-step activities including decision points and loops

Answer

A process map (flowchart) captures granular steps, decisions, and flow paths, providing far more detail than the high-level SIPOC overview.

Question 4

In a data collection plan, 'stratification' means:

Accepted Answer

Grouping data by category (e.g., shift, machine) to reveal hidden patterns

Answer

Stratification splits data into meaningful subgroups so that differences between groups — not just overall averages — can be detected.

Question 5

What does 'percent gage R&R' measure in a measurement system analysis?

Accepted Answer

The percentage of total observed variation attributable to the measurement system

Answer

Percent Gage R&R quantifies how much of the total study variation comes from the measurement system versus actual part-to-part variation.

Lean Six Sigma Yellow Belt Certification Practice Test