Statistical populationComplete set of items that share at least one property in common that is the subject of a statistical analysisIn statistics, a population is a set of similar items or events which is of interest for some question or experiment. A statistical population can be a group of existing objects ( e. g. the set of all stars within the Milky Way galaxy ) or a hypothetical and potentially infinite group of objects conceived as a generalization from experience ( e. g. the set of all possible hands in a game of poker ) . A common aim of statistical analysis is to produce information about some chosen population.
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In statistical inference, a subset of the population ( a statistical sample ) is chosen to represent the population in a statistical analysis. Moreover, the statistical sample must be unbiased and accurately model the population ( every unit of the population has an equal chance of selection ) . The ratio of the size of this statistical sample to the size of the population is called a sampling fraction. It is then possible to estimate the population parameters using the appropriate sample statistics. ،
Mean
The population mean, or population expected value, is a measure of the central tendency either of a probability distribution or of a random variable characterized by that distribution
جامعه آماری ( به انگلیسی: Statistical population ) ، عبارت است از مجموعه کامل اندازه های ممکن یا اطلاعات ثبت شده از یک صفت کیفی، در مورد گردآورده کامل واحدها، که می خواهیم استنباط هایی راجع به آن انجام دهیم.
منظور از عمل گردآوردن داده ها، استخراج نتایج درباره جامعه می باشد. یا به بیان ساده تر، در هر بررسی آماری، مجموعه عناصر مورد نظر را جامعه می نامند در نتیجه جامعه، مجموعه تمام مشاهدات ممکن است که می توانند با تکرار یک آزمایش حاصل شوند.
