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Besides simple random sampling , there are other forms of sampling that involve a chance process for getting the sample . Other well-known random sampling methods are the stratified sample , the cluster sample , and the systematic sample . To choose a stratified sample , divide the population into groups called strata and then take a proportionate number from each stratum . For example , you could stratify -LRB- group -RRB- your college population by department and then choose a proportionate simple random sample from each stratum -LRB- each department -RRB- to get a stratified random sample . To choose a simple random sample from each department , number each member of the first department , number each member of the second department , and do the same for the remaining departments .
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