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ASTM International , 04/01/2013
Publisher: ASTM
File Format: PDF
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1.1This practice presents methodology for the setting of an upper confidence bound regarding a unknown fraction or quantity non-conforming, or a rate of occurrence for nonconformities, in cases where the method of attributes is used and there is a zero response in a sample. Three cases are considered.
1.1.1The sample is selected from a process or a very large population of discrete items, and the number of non-conforming items in the sample is zero.
1.1.2A sample of items is selected at random from a finite lot of discrete items, and the number of non-conforming items in the sample is zero.
1.1.3The sample is a portion of a continuum (time, space, volume, area etc.) and the number of non-conformities in the sample is zero.
1.2Allowance is made for misclassification error in this standard, but only when misclassification rates are well understood or known and can be approximated numerically.
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