De omvang van de steekproef bij een enkelvoudig steekproefsysteem |
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Abstract: | Summary (Sample size for a single sampling scheme). The operating characteristic of a sampling scheme may be specified by the producers 1 in 20 risk point ( p 1), at which the probability of rejecting a batch is 0.05, and the consumers 1 in 20 risk point ( p 2) at which the probability of accepting a batch of that quality is also 0.05. A nomogram is given (fig. 2) to determine for single sampling schemes and for given values of p1 and p 2 the necessary sample size ( n ) and the allowable number of defectives in the sample ( c ). The nomogram may reversedly be used to determine the producers and consumers 1 in 20 risk points for a given single sampling scheme. The curves in this nomogram were computed from a table of percentage points of the χ2 distribution. For v > 30 Wilson and Hilferty's approximation to the χ2 distribution was used. |
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