Simple random sampling - members of a group are selected at randomly and each member of the group has an equal chance of being selected.
The process of selecting sample members so that groups can be compared is known as stratified purposive sampling.
Stratified sampling is a particular method for carrying out the more general purpose of purposive sampling in qualitative research. In this instance, categorizing the larger population into subgroups pertinent to the research objectives guarantees that the data will contain instances from each of these categories.
In stratified sampling, respondents are divided into groupings known as strata based on shared traits (e.g., race, gender, educational attainment, etc). A different probability sampling technique is used to randomly sample each subgroup once it has been divided.
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