But she cautioned that so few people in the survey reported robberies that the bureau cannot be certain whether those figures represent a true increase or a random sampling variation.
但她警告说，调查中向警察报告抢劫案的人太少了，这使得统计局无法确定这些数据是真实增加了还是只是一个随机的变量。
On a limited sampling, the single-operator coefficient of variation has been found to be 9.1 %.
根据有限取样，发现每个操作员试验结果的变化系数为9.1 %。
Also the results showed that the Stratified Random ClusterSampling is an adequate sampling method for the genetic variation analysis of yellow cattle population.
同时研究表明，系统随机整群抽样是进行黄牛群体遗传变异分析的最适抽样方法。
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