Simple random sampling in random sampling method

Simple random sampling, also known as pure random sampling, is a method of sampling and investigating the total amount completely randomly without any grouping arrangement in advance. Simple random sampling can generally be carried out by drawing lots, shaking numbers or looking up a random number table. This sampling method is more suitable for small differences between the whole units. Implementation steps: (1), obtain the whole unit catalogue, that is, all respondents; (2), for the whole unit number; (3), using lottery, random number table, etc. Take a sample.