# Portal:Statistics

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Statistical methods are used to summarize and describe a collection of data; this is called Statistics arose no later than the 18th century from the need of states to collect data on their people and economies, in order to administer them. The meaning broadened in the early 19th century to include the collection and analysis of data in general. ## Selected article
The The margin of error is usually defined as the radius of a confidence interval for a particular statistic from a survey. One example is the percent of people who prefer product A versus product B. When a single, global margin of error is reported for a survey, it refers to the maximum margin of error for all reported percentages using the full sample from the survey. If the statistic is a percentage, this maximum margin of error can be calculated as the radius of the confidence interval for a reported percentage of 50%. The margin of error has been described as an "absolute" quantity, equal to a confidence interval radius for the statistic. For example, if the true value is 50 percentage points, and the statistic has a confidence interval radius of 5 percentage points, then we say the margin of error is 5 percentage points. As another example, if the true value is 50 people, and the statistic has a confidence interval radius of 5 people, then we might say the margin of error is 5 people.
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## Did you know?- ... that the Holtsmark distribution was proposed in 1919 as a model for the gravitational field of stars?
- ... that variables and attributes are some of the most basic concepts in science?
- ... that although randomness had long been viewed as an obstacle, it is now used as a tool for designing better algorithms?
- ... that the Jadad scale is the world's most widely used means of assessing the methodological quality of clinical trials?
- ... that Ulpian's life table predicted a life expectancy of 19 to 23 years for citizens of the Roman Empire?
- ... that there are many ways to create misleading graphs?
- ... that while the center of gravity for a set of points is located at the spot from which the
*sum of the squares of distances*to all the points is minimized, the geometric median is the spot from which the*sum of distances*is minimized? - ... that square root biased sampling was originally developed as a way to sample long sequences of DNA?
- ... that the Laplace distribution with a mean of zero is a special case of the geometric stable distribution?
## Topics in Statistics
## Statistics categoriesClick an arrow symbol to expand any of the sub-categories: ## Wikimedia |