Simple random sampling uses a sample of size n from a population of size n to obtain data that can be used to make inferences about the characteristics of a population. Suppose that, from a population of 50 bank accounts, we want to take a random sample of four accounts in order to learn about the population. How many different random samples of four ac- counts are possible?
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A sampling method is a procedure for selecting sample members from a population. Three common sampling methods are: simple random sampling , stratified sampling , and cluster sampling .
The main types of probability sampling methods are simple random sampling, stratified sampling, cluster sampling, multistage sampling, and systematic random sampling. The key benefit of probability sampling methods is that they guarantee that the sample chosen is representative of the population.
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