Sampling is a process of selecting a representative subset of a population for analysis. Sampling and analysis are part of a process to answer research questions. Populations and sampling methods are different, depending on the size and variation of the population, and the question to be answered. For example in a nationwide study of political opinions, people answer questions about their tendency to vote for candidates, or supporting a political party. For potential customers of a new baby stroller, people answer questions about their interest in this product, and their tendency to purchase it. Both studies are nationwide, but the target population is not the same. In the first example, the population is made of all registered ...
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