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在假设各丝绞纤度期望值和丝绞内纤度均服从正态分布的条件下,导出分组抽样样本方差及均方差的方差计算式,并给出相应的等效样本容量,使偏差的分组抽检分级问题通过随机抽检分级理论得到解决。本文还阐明了绞间偏差对检验结果的影响及抽检方案的评价等基本问题。有关理论结果通过电算模拟试验得到验证。
Based on the assumption that the expected value of filament strands and filament denier are both normal distributions, the formula of variance of variance and mean square deviation of sampling samples is derived and the corresponding equivalent sample size is given. The problem is solved by a random sampling grading theory. The paper also clarifies the basic problems such as the influence of skew deviation on the test results and the evaluation of sampling plans. The theoretical results are verified by computer simulation test.