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What is a Request for Comment (RFC)?
Expected Value
The predicted average outcome of a random variable, computed as the weighted average of all possible values.
Stratified Random Sampling
A probability sampling method in which the population is first divided into strata and a simple random sample is then taken from each stratum.
Strata
Subsets of a population that are known to be homogeneous with respect to some characteristic, used in stratified sampling.
Frame
A listing of the elements the sample will be selected from.
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