A statistician, or anyone who wants to ensure that, for a population that can be divided into a set of strata, the sample is forced to contain the same proportion from each stratum.
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They include: Simple random sampling, Systematic sampling, Stratified sampling, Quota sampling, and Cluster sampling.
simple random, stratified sampling, cluster sampling
Nothing! there the same
You can't conduct startified sampling if there are no difinative groups, thus systematic sampling is more efficient if your data has no groups.