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**Population density**(in agriculture: standing stock or plant**density**) is a measurement of**population**per unit land area. It is mostly applied to humans, but sometimes to other living organisms too. It is a key geographical term. [1] In**simple**terms,**population density**refers to the number of people living in an area per square kilometre or other ...Statistics is a mathematical body of

**science**that pertains to the collection, analysis, interpretation or explanation, and presentation of data, [9] or as a branch of mathematics. [10] Some consider statistics to be a distinct mathematical**science**rather than a branch of mathematics. While many scientific investigations make use of data ...A demographic structure of a

**population**is how populations are often quantified. The total number of individuals in a**population**is defined as a**population**size, and how dense these individuals are is defined as**population****density**. There is also a**population**’s geographic range, which has limits that a species can tolerate (such as temperature).Averaging the Gaussians yields the

**density**estimate shown in the dashed black curve. In statistics, probability**density**estimation or simply**density**estimation is the construction of an estimate, based on observed data, of an unobservable underlying probability**density**function. The unobservable**density**function is thought of as the**density**...A

**population**ecology concept is r/K selection theory, one of the first predictive models in ecology used to explain life-history evolution. The premise behind the r/K selection model is that natural selection pressures change according to**population****density**. For example, when an island is first colonized,**density**of individuals is low.**Population**models are used to determine maximum harvest for agriculturists, to understand the dynamics of biological invasions, and for environmental conservation.**Population**models are also used to understand the spread of parasites, viruses, and disease. Another way populations models are useful are when species become endangered.