Certified Six Sigma Black Belt Measurement System Analysis Questions and Answers Flashcards
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What is the primary purpose of a stability study in measurement system analysis?
Answer: To assess whether measurement results change over time
A stability study tracks measurements of a reference standard over time to determine if the measurement process remains statistically consistent.
When conducting an attribute agreement analysis, what does a kappa statistic of 0.85 indicate?
Answer: Strong agreement among appraisers
A kappa value of 0.85 falls in the strong agreement range (typically 0.75-0.90), indicating appraisers are highly consistent in their pass/fail decisions.
In a nested Gage R&R design, what distinguishes it from a crossed design?
Answer: Each part is measured by only one operator rather than all operators
In a nested design, each part is measured by only one operator because the parts are consumed or altered during measurement, making it impossible for all operators to measure every part.
What percentage of total variation attributed to the measurement system is generally considered marginally acceptable?
Answer: Between 10% and 30%
A measurement system contributing between 10% and 30% of total variation is considered marginally acceptable and may be suitable depending on the application and cost factors.
Which graphical tool is most useful for identifying operator-by-part interaction in a Gage R&R study?
Answer: Interaction plot of operator versus part
An interaction plot displays average measurements for each operator across parts, and non-parallel lines indicate that operators measure certain parts differently.
What is the effect of inadequate measurement discrimination (resolution) on a process capability study?
Answer: It causes the capability index to appear lower than the true value
Poor measurement discrimination adds measurement variation to the observed process spread, making the process appear more variable and reducing the calculated capability index.