Limits of tolerance and z-scores in ring tests
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A series of objections are discussed to the use of symmetrical tolerance intervals in ring tests as part of a procedure for laboratory assessment. Instead, a modified, asymmetrical tolerance interval is introduced which takes these objections into consideration. A modified z-score is proposed corresponding to the modified tolerance interval.
KeywordsLaboratory Assessment Tolerance Interval Ring Test Asymmetrical Tolerance Symmetrical Tolerance
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