方法：采用随机抽样法。

Methods:Adopt method of random sampling.

对于随机抽样和非随机抽样，样本容量确定的思路有显著差异。

The thought pattern in determination of the sample size is different between random sampling and non-random sampling.

方法采用整群随机抽样和单纯随机抽样方法确定调查对象.

Methods Cluster sampling and random sampling Methods: Were used to choose the subject.

简单随机抽样精密度

Precision of simple random sampling

方法采用分层整群随机抽样的调查方法.

Methods Stratified chester random sampling.

我们在每批一百件的货品中取五件随机抽样.

We did the random sampling of five pieces per batch of 100.

本文在PPS抽样方案和有效回简单随机抽样方案的情形下构造了这两种估计并精确比较了它们的优劣.

Two kinds of estimators were compared under PPS sampling and simple random sampling with replacement.

方法：简单随机抽样问卷调查和非结构式访谈。

Method:Using simple random sampling survey and non-structured interviews.

方法：简单随机抽样问卷调查和非结构式访谈。

Method: Using simple random sampling survey and non-structured interviews.

本文对随机抽样数目对状态估计结果的影响进行了讨论。

Effect of random sampling number on state estimation is discussed.