Final answer:
The correct answer is option B, A measurement system that provides measurements on a continuous scale is not necessary for Gage R & R for attribute data, as attribute data does not require a continuous scale. Gage R & R for attribute data evaluates categorical data like pass/fail or accept/reject criteria. The option is b.
Step-by-step explanation:
The question asks about performing a Gage R & R, which is a statistical tool used in quality management, specifically for assessment of a measurement system. The correct answer to the question, 'Which of the following is not necessary when performing a Gage R & R for attribute data?' is option B.
A measurement system that provides measurements on a continuous scale is not necessary for Gage R & R for attribute data since attribute data is categorical and does not require a continuous scale; instead, it is assessed on a pass/fail or an accept/reject basis.
A target percentage for repeatability and reproducibility agreement (option A), a standard for evaluation (option C), and at least two appraisers (option D) are indeed necessary components of a Gage R & R study for either attribute or variable data.
The presence of appraisers is necessary to assess inter-rater reliability, and standards are essential to determine the consistency and correctness of the measurements. The correct option is b.