Statistics Dictionary

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Probability Sampling

Statisticians distinguish between two broad categories of sampling .

  • Probability sampling. With probability sampling, every element of the population has a known probability of being included in the sample.

  • Non-probability sampling. With non-probability sampling, we cannot specify the probability that each element will be included in the sample.

Probability samples allow us to make probability statements about sample statistics. We can estimate the extent to which a sample statistic is likely to differ from a population parameter . The bulk of this website focuses on probability sampling.

See also:   Tutorial: Survey Sampling