All sampling units of the population get the sampling came. This sampling can be divided into 2 sub sampling method was by way of raffle and sampling using random number tables sampling and using computer sampling.
The sampling of the population have been sampling all the same. This sampling method can be divided into two sub-sampling by drawing lots. The sampling and using a table of random numbers. And random sampling by the computer.
Sampling population get to every unit of sampling rate Sampling, this can be divided into 2 sub way is sampling by way of drawing. Sampling and using a table of random numbers.