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In this chapter, we address sampling, or developing a group of people you have carefully chosen who will be part of your research study. A sample is a way of representing the wider world through a small population that you study. Most researchers use samples, because unless you are working in a very small community or population, it is almost impossible for you to include everyone as participants. Researchers have to decide what kind of sample to employ, and the most basic of these decisions is to determine whether they should use a probability or nonprobability sample.