Stratified random sample = the entire population is divided (stratified) into groups based on an important characteristic; subjects are then randomly selected from each group (or strata)
Cluster sampling = process of sampling in stages starting with groups within the population and then individuals within the groups
The sampling unit changes in a cluster sample.
The sampling unit is the element of the population being selected.
The unit may be families, schools,
hospitals first, then individuals.
Systematic sampling = process of selecting a random sample by choosing subjects at a fixed interval (kth), such as every 10th member of a population
The population is still enumerated, but rather than using a random numbers table every kth individual is selected.
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