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convenience sample
A sample that is taken from a group that is easy to reach.
margin of error
The amount of error that is allowed in the results of a survey or study.
nonprobability sample
A sample that is not selected using random sampling methods.
random sample
A sample in which every member of the population has an equal chance of being selected.
stratified random sampling
A sampling method that involves dividing the population into subgroups and taking a random sample from each.