Certified Six Sigma Black Belt Exam Measurement System Analysis (MSA) 2

Question 1

In a Gauge R&R study, what does the 'Reproducibility' component measure?

Accepted Answer

Variation when different operators measure the same part

Answer

Reproducibility captures the variation introduced when different appraisers (operators) use the same gauge to measure the same parts.

Question 2

A %Tolerance method in MSA divides the total Gauge R&R variation by which value?

Accepted Answer

The engineering tolerance (USL – LSL)

Answer

The %Tolerance method evaluates whether gauge variation is acceptable relative to the specification width (USL minus LSL).

Question 3

Which index represents the ability of a measurement system to detect small shifts in the process mean?

Accepted Answer

Number of Distinct Categories (NDC)

Answer

The Number of Distinct Categories (NDC) indicates how many statistically distinct groups the measurement system can resolve in the process data.

Question 4

During an MSA study, an operator consistently reads a gauge 0.05 mm higher than the true value across all measurements. This is an example of:

Accepted Answer

Bias

Answer

Bias is a systematic, consistent offset between the observed average measurement and the true (reference) value.

Question 5

What is the primary purpose of using a control chart (X-bar and R chart) within a Gauge R&R study?

Accepted Answer

To verify that parts used in the study represent adequate variation

Answer

In a Gauge R&R study, control charts help confirm that selected parts span the actual process variation, which is necessary for a valid study.

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