When appropriate, the number of units in the sample shall be selected in proportion to the size of sub-lots or sub-batches, or parts or the lot or batch, identified by some rationale criterion.A lot sampling plan is a statement of the sample size or sizes to be used and the associated acceptance and rejection numbers.The producer would like to design a sampling plan such that there is a high probability of accepting a lot that has a defect level less than or equal to the Acceptable Quality Level (AQL). The AQL is a percent defective that is the baseline requirement for the quality of the producer’s product.Inspection whereby either the unit of product is classified simply as defective or no-defective or the number of defects in the unit of product is counted, with respect to a given requirement or set of requirements.
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