Double Sampling for Lot Average

Abstract
This paper presents a procedure for matching double sampling plans to given single sampling plans. The procedure assumes sampling from a normal distribution with known standard deviation and assumes that lot average is the property of interest. It is applicable, for example, to sampling of bulk material. Double sampling plans with the “best” average sample size are discussed. An example shows how to use the procedure to find approximately matching double and single sampling plans for sampling from a binomial distribution.

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