The calculation formulas of sample size based on the error limitation are given for estimation of population mean.
对于样本均值估计总体均值，给出了基于误差限制的样本容量的计算式。
This paper deals with the estimation of population mean in systematic sampling by use of auxiliary information in order to improve the accuracy of the estimate.
讨论了等距抽样中，如何利用辅助信息改进总体平均值的估计，以达到提高估计精度之目的。
This paper deals with the incomplete sample estimation of finite population mean in existing of nonrespondent sampling units.
本文讨论了存在不回答样本单位时，有限总体均值的缺损样本估计。
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