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As we can see, this is a relatively diverse population. When we draw our sample, we want to have a good representation of all of the kinds of people in the population. Sampling procedures fall into two broad categories:
- probability sampling
- nonprobability sampling
Most probability sampling strategies have a random or chance component, though there are some important exceptions. It is this random component that gives us confidence that our sample is a reasonably good representation of the population. This random component can be time-consuming and expensive, so there are other alternatives for selecting a study sample. We will discuss and give examples of each type of sample.
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