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The shape of a distribution will fall somewhere in a continuum where a flat distribution might be considered central and where types of departure from this include: mounded (or unimodal), U-shaped, J-shaped, reverse-J shaped and multi-modal. [1] A bimodal distribution would have two high points rather than one. The shape of a distribution is ...
In statistics, a population is a set of similar items or events which is of interest for some question or experiment. [1] [2] 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 ...
As the number of discrete events increases, the function begins to resemble a normal distribution. Comparison of probability density functions, p ( k ) {\textstyle p(k)} for the sum of n {\textstyle n} fair 6-sided dice to show their convergence to a normal distribution with increasing n a {\textstyle na} , in accordance to the central limit ...
A visual representation of the sampling process. In statistics, quality assurance, and survey methodology, sampling is the selection of a subset or a statistical sample (termed sample for short) of individuals from within a statistical population to estimate characteristics of the whole population.
More specifically, this calculation is called the mean center of population. [3] After moving roughly 600 miles (966 km) west by south during the 19th century, the shift in the mean center of population during the 20th century was less pronounced, moving 324 miles (521 km) west and 101 miles (163 km) south. Nearly 79% of the overall southerly ...
The various strategies and algorithms have been classified a number of ways, generally according to their strategies with respect to preserving shape and topology. Those that preserve shape are sometimes called equiform, although isomorphic (same-shape) or homomorphic (similar-shape) may be better terms. Three broad categories are widely ...
Recent census data shows that the number of immigrants living in Massachusetts has increased over 5% from 2000 to 2005. The biggest influxes are Latin Americans. According to the census, the population of Central Americans rose by 67.7% between 2000 and 2005, and the number of South Americans rose by 107.5%.
The arithmetic mean of a population, or population mean, is often denoted μ. [2] The sample mean ¯ (the arithmetic mean of a sample of values drawn from the population) makes a good estimator of the population mean, as its expected value is equal to the population mean (that is, it is an unbiased estimator).