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Learn about population density, a measurement of population per unit land area, and its applications to humans and other living organisms. See maps and data of population density by country, continent and region, and compare with other factors such as urbanization and climate.
A statistical unit is one member of a set of entities being studied in statistics. Learn the difference between experimental units and sampling units, and how they are used in various statistical studies and analyses.
A statistical population is a set of similar items or events that are of interest for some question or experiment. Learn about the population mean, a measure of central tendency, and how it differs from the sample mean.
Learn the definition, formula and examples of standard deviation, a measure of variation of a random variable or data set. Find out how to calculate the population and sample standard deviation, and the difference between them.
Population growth is the increase in the number of people in a population or dispersed group. Learn about the factors, trends and projections of global human population growth, as well as the logistic and exponential models of population dynamics.
Urban density is the number of people inhabiting a given urbanized area, excluding non-urban land-uses. It is a factor in understanding how cities function, and has positive and negative effects on sustainability, economy, health and innovation.
A shampoo label from the U.S. that shows a round metric quantity taking secondary status in parentheses next to non-integer U.S. customary quantity. Metrication (or metrification) is the process of introducing the International System of Units, also known as SI units or the metric system, to replace a jurisdiction's traditional measuring units.
The estimates produced by the Population Estimates Program are used in determining how federal funds should be allocated throughout the United States. [1] The annual population estimates are also used as controls for the American Community Survey and the U.S. Current Population Survey , which in turn measure diverse demographic data on social ...