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Glossary
These is glossary of research key terms. This glossary is intended as an aid to professionals and non-professionals who find the world of research somewhat intimidating. While it is impossible to cover all the terms that can be confusing, this document briefly defines some of the more common terms and concepts.

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Probability Sampling
Any sampling scheme in which the probability of choosing each individual is the same (or at least known, so it can be readjusted mathematically to be equal). Also called random sampling. Probability samples are more costly to obtain, but are more accurate, and they allow the researcher to calculate the amount of error she can expect. There are three major kinds of probability sampling: simple random sampling (SRS), stratified sampling, and cluster sampling.
 


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