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Sampling, Sample Design

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What is the purpose of sampling? What are some of the concerns and dangers of sampling? How important is the sample design to the validity of your data? Explain. Provide an example where a sample could misrepresent the validity of the data.

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The purpose of sampling is to obtain data from a population so that by studying the sample, inferences can be made about the population. Since populations are generally of large sizes, it is not practically possible to collect data on an entire population. Therefore, we select units from the population to constitute our sample, study the sample and generalize our findings to the population at large.

Concerns about sampling may pertain to the mechanism of sampling ...

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