Certified Six Sigma Black Belt Exam Certified Six Sigma Black Belt Measurement System Analysis (MSA) 1

Question 1

In Measurement System Analysis, what does 'bias' specifically refer to?

Accepted Answer

The difference between the observed average measurement and the accepted reference value

Answer

The variation observed when a single appraiser measures the same part multiple times

Answer

The change in measurement system performance over an extended period

Answer

The inconsistency of measurements across the full operating range of the gauge

Question 2

Which source of variation is captured by the ANOVA method in a Gage R&R study that the traditional Range (Average & Range) method cannot detect?

Accepted Answer

Appraiser-by-part interaction

Answer

Equipment variation (repeatability)

Answer

Appraiser variation (reproducibility)

Answer

Part-to-part variation

Question 3

A Gage R&R study reports that the %Contribution of total Gage R&R to total variation is 6%. What does this value indicate about the measurement system?

Accepted Answer

The measurement system is acceptable because measurement error accounts for only 6% of total observed variance

Answer

The measurement system is unacceptable because %Contribution should exceed 10%

Answer

The measurement system requires conditional approval and further cost-benefit analysis

Answer

The number of distinct categories (ndc) will be less than 2, making the system unfit for use

Question 4

In an Attribute Agreement Analysis, a Kappa value of 0.52 is calculated for an appraiser compared to the standard. How should this result be interpreted?

Accepted Answer

Moderate agreement — the system may require improvement before use in production

Answer

Excellent agreement — the measurement system is fully acceptable

Answer

Poor agreement — the appraiser must be retrained and the study repeated immediately

Answer

The Kappa statistic is not applicable to attribute measurement systems

Question 5

When is a nested (hierarchical) Gage R&R design required instead of a crossed Gage R&R design?

Accepted Answer

When the measurement process is destructive and the same part cannot be remeasured

Answer

When the number of appraisers exceeds five

Answer

When the gauge has a known linearity problem across its range

Answer

When parts come from more than one production line

Question 6

A measurement system's stability study reveals a gradual upward drift in readings on a reference standard over several weeks. What is the most appropriate corrective action?

Accepted Answer

Investigate and address root causes such as tool wear, environmental changes, or calibration drift, then recalibrate the gauge

Answer

Increase the number of appraisers to offset the drift through averaging

Answer

Switch from the Range method to the ANOVA method to better quantify the drift

Answer

Widen the specification limits to accommodate the unstable measurement system