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Sampling Plans

Sampling is used to inspects batches of products. To avoid calculation, and negotiation, published standard sampling plans are normally used. The most commonly accepted sampling plan is ANSI/ASQ Z1.4-2003.

The figure shows an example of a page from a sampling plan:

The first step is to find the sample size code letter. This is obtained from a separate table and is based on the lot size and the severity of the inspection required. A value for the AQL is also selected.

The table shown above is then used to find the sample accept/reject values. For example if the code letter were 'N' and the AQL was 0.15 then the sample size would be 500. The batch would be accepted if there were 1 defect or less, and rejected if there were two defects or more.

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