Measurement System Analysis (MSA) Flashcards
7 cards from real Certified Six Sigma Black Belt Exam practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Measurement System Analysis (MSA) flashcards as text
In a Gauge R&R study, what does the 'Reproducibility' component measure?
Answer: Variation when different operators measure the same part
Reproducibility captures the variation introduced when different appraisers (operators) use the same gauge to measure the same parts.
A %Tolerance method in MSA divides the total Gauge R&R variation by which value?
Answer: The engineering tolerance (USL – LSL)
The %Tolerance method evaluates whether gauge variation is acceptable relative to the specification width (USL minus LSL).
Which index represents the ability of a measurement system to detect small shifts in the process mean?
Answer: Number of Distinct Categories (NDC)
The Number of Distinct Categories (NDC) indicates how many statistically distinct groups the measurement system can resolve in the process data.
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:
Answer: Bias
Bias is a systematic, consistent offset between the observed average measurement and the true (reference) value.
What is the primary purpose of using a control chart (X-bar and R chart) within a Gauge R&R study?
Answer: To verify that parts used in the study represent adequate variation
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.
In the ANOVA method for Gauge R&R, which source of variation is uniquely captured compared to the Xbar-R method?
Answer: Operator-by-Part interaction
The ANOVA method separately quantifies the Operator × Part interaction, which the traditional Xbar-R method cannot isolate.
A measurement system has a %GRR of 18% using the study variation method. How should this be classified according to AIAG guidelines?
Answer: Marginal — may be acceptable depending on application
AIAG guidelines classify %GRR between 10% and 30% as marginal, requiring judgment based on the application's criticality.