Search results
Results from the WOW.Com Content Network
The Demography of the World Population from 1950 to 2100. Data source: United Nations — World Population Prospects 2017. Demography (from Ancient Greek δῆμος (dêmos) 'people, society', and -γραφία (-graphía) 'writing, drawing, description') is the statistical study of human populations: their size, composition (e.g., ethnic group, age), and how they change through the interplay ...
t. e. A settlement hierarchy is a way of arranging settlements into a hierarchy based upon their size. The term is used by landscape historians and in the National Curriculum [1] for England. The term is also used in the planning system for the UK and for some other countries such as Ireland, India, and Switzerland.
Population density is the number of people per unit of area, usually transcribed as "per square kilometer" or square mile, and which may include or exclude, for example, areas of water or glaciers. Commonly this is calculated for a county, city, country, another territory or the entire world . The world's population is around 8,000,000,000 [3 ...
The standard deviation σ of X is defined as which can be shown to equal. Using words, the standard deviation is the square root of the variance of X . The standard deviation of a probability distribution is the same as that of a random variable having that distribution. Not all random variables have a standard deviation.
Mark and recapture. Mark and recapture is a method commonly used in ecology to estimate an animal population 's size where it is impractical to count every individual. [1] A portion of the population is captured, marked, and released. Later, another portion will be captured and the number of marked individuals within the sample is counted.
The population in the Nordic countries is getting older and according to the population projection for the Nordic countries as a whole, the share of the population above the age of 80 will reach 8.4 per cent in 2040, as compared to the 2013 level of 4.7 per cent. The share of population 80 years or older has increased from 1990 to 2013.
The labor force is the actual number of people available for work and is the sum of the employed and the unemployed. The U.S. labor force reached a high of 164.6 million persons in February 2020, just at the start of the COVID-19 pandemic in the United States. [1] Before the pandemic, the U.S. labor force had risen each year since 1960 with the ...
In 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).