Basically there are two main sampling techniques.
(i) Random Sampling: This is a method of sampling in which each item of the population has equal chance of being included in the samples. Random sampling can be from either finite samples or infinite samples.
(ii) Stratified Sampling: It is a technique employed when population is heterogeneous with respect to the variables (parameters) under study. The population is divided into varying homogeneous groups or strata and random sample is drawn from each stratum and pooled together.
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