抽样是研究和数据收集中不可或缺的方法，能够从更大数据中获得有意义的见解并做出明智的决定的子集。不同的研究领域采用了不同的抽样技术，每种技术都有其独特的优点和局限性。本文将深入探讨了最常见的抽样技术，包括随机抽样、分层抽样、系统抽样 ...

Suppose that the sample of students described in the previous section was actually selected using stratified random sampling. In stratified sampling, the study population is divided into ...

Categorical Variable: the variable whose values can be put into categories (groups). Cluster Sampling: a researcher divides the population into clusters. Then, a simple random sample of the clusters ...