以下为句子列表：
英文: Abstract: To settle the numbers of groups, the moth and features of group sampling are analysed, and its estimator is goven.Then using CauchySchwartz unequility, it seeks the best apportion with finite cost.
中文: 文摘:为了确定分类抽样的各类单位数,分析了分类抽样的抽取方法和特点,同时给出其简单估计,然后利用柯西-施瓦茨不等式推导出在给定调查费用情况下的最优分配.
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