The Average Sample Number for Truncated Single and Double Attributes Acceptance Sampling Plans

Abstract

In attributes sampling acceptance plans the decision to reject the lot can often be made before inspection of a single sample is completed. In double sampling, the same decision may be possible before inspection of the first sample is completed or, if a second sample is required, before the second sample is completely inspected. Or, in double sampling one may always complete the inspection of the first sample, but if a second sample is required, terminate inspection of the second sample if the lot can be rejected before it is completely inspected. Using two formulas, believed to be new, it is shown how to compute the average sample number under these three hinds of truncation and tables of results for typical sampling plans are given.

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