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 Statistics is a type of data analysis which practice includes the planning, summarizing, and interpreting of observations of a system possibly followed by predicting or forecasting of future events based on a mathematical model of the system being observed. Statistics is a branch of applied mathematics specifically in the area of statistical theory which uses probability theory in the mathematical models. The basic tenet of statistics is that a population can be represented by a sample of the population when the sample is sufficiently large and when the sample is composed of a random selection of units (persons, components, or of whatever the population is composed) from the population. Statistical theory provides methods for determining how large a sample is needed to provide for statistically significant results. (From Wikipedia, the free encyclopedia.) |
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