簡單抽樣的方法

 (a) Non-probability sampling The probability of the members being selected into the sample is unknown. Convenience sampling － The sample is selected at convenience. (b) Probability sampling The sample is selected entirely by chance. Moreover, each member of the population has a known probability of being selected into the sample. (i) Simple random sampling Select the sample by using random numbers (or letters, symbols, etc.). (ii) Systematic sampling The population is arranged in a certain order and members of the population are selected at a fixed interval. (iii) Stratified random sampling The population is divided into different strata according to a stratifying variable, then the sample is selected in proportion to the sizes of each stratum by simple random sampling.

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