1.2 Simple Random Sampling

Census, 全部信息

Sampling

抽样方式:

representative sample:有偏向,研究者选择自己觉得有代表性的sample

probability sampling:使用随机数表不用研究者来抽样,较为客观(研究者可以选择自己觉得有代表性和没有代表性的sample)

simple random sampling.

simple random sampling with replacement, whereby a member of the population can be selected more than once;

 the other is simple random sampling without replacement, whereby a member of the population can be selected at most once

不加说明情况下,simple random sampling特指without replacement (不放回)

Random-Number Tables

最后选出:

 

Experimentation

 

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