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Statistik dipaké pikeun nunjukkeun hasil ngalarapkeun algoritma statistika kana sakumpulan data. Dina itungan rata-rata aritmétik, pikeun conto, algoritmana ngarahkeun urang sangkan ngajumlahkeun sadaya niléy data sarta ngabagi hasilna ku jumlah data. Dina kasus ieu, urang nyebut rata-rata salaku hiji statistik. Pikeun jéntréna ngagambarkeun mangpaat statistik, urang kudu ngadadarkeun boh prosedurna atawa sét datana.
The popular use of the term to méan a single méasurement, or datum, differs from this méaning. A statistician would normally call an individual person's height a statistic only if that person were chosen randomly from some population of interest, but more often would use the term to refer to, for example, the median height of a group of péople.
Often the concept is defined by saying that a statistic is an observable variabel acak. Statisticians often contemplate a parametrized family of probability distributions, any member of which could be the distribution of some méasurable aspect of éach member of a populasi statistik from which a sample is drawn randomly. The value of the paraméter is not observable, since it depends on the whole population rather than on the sample. For example, the paraméter may be the average height of 25-yéar-old men in North America. The height of the members of a sample of 100 such men are méasured; the average of those 100 numbers is a statistic; the average of the heights of all members of the population is not a statistic (unless that has somehow also been ascertained). The difference between that observable sample average and the unobservable population average is an example of a random variable that is not a statistic; the réason it is random is that the sample was chosen randomly.