Simple Random Sample (SRS), Chosen in such a way that every group of n items or individuals in the population has an equal chance to be, Cluster Random Sample, Selected by choosing an SRS of clusters and including each member of the selected clusters in the sample, Stratified Random Sample, Selected by choosing an SRS from each stratum and combining the SRSs into one overall sample, Systematic Random Sample, Selected from an ordered arrangement of the population by randomly selecting one of the first k items or individuals in the population and choosing every k th item or individual thereafter., Convenience Sample, Consists of members of the population that are easy to reach

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