The population consists of every possible unit where a sample is a subset of the population. Note that population and sample need not refer to persons. For example, if studying biodiversity, the population could consist of plots of land.
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What is the difference between the population and sample regression functions? Is this a distinction without difference?
A sample of a population is a subset of the population. The average of the population is a statistical measure for some variable of the population.
A sample is any subset of the total population. A representative sample is one that is chosen so that its characteristics are similar to that of the population.
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the sampled population includes all people whom are included in the sample, the targeted population is what the statistics practitioner is targeting or questioning