Advantages of single sampling and double sampling plans
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Designs in which initially a sample of units is selected for obtaining auxiliary information only, and then a second sample is selected in which the variable of interest is observed in addition to the auxiliary information. Double sampling is also called two-phase sampling. ... Ratio estimation with double sampling.Two methods for choosing a single sample acceptance plan. A single sampling plan, as previously defined, is specified by the pair of numbers (n,c). The sample size is n, and the lot is rejected if there are more than c defectives in the sample; otherwise the lot is accepted
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