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Statistical Inference

Statistical inference describes generalizations that go beyond the data in an attempt to predict, compare, estimate, or determine a course of action. The resultant statistics are used to estimate unknown values of the population (anything from demographic data, to purchase behavior, to psychographic info, etc.) of the population, based on a data sample of the population.  

For example, a study to determine the percentage of people in the US who suffer from allergies would find it impossible to survey every person in the U.S. Determining the incidence of flu sufferers among a representative sample of US citizens would enable them to infer the incidence of allergy sufferers among the US population.
Statistical inference is one of the two ways in which data can be analyzed. The other is  via descriptive statistics.

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