Defining a population
In applying statistics to a scientific, industrial, or societal problem, it is necessary to begin with a population or process to be studied. Populations can be diverse topics such as "all persons living in a country" or "all stamps produced in the year 1943".
Source
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"Centenarul artileriei române."
http://commons.wikimedia.org/wiki/File:Centenarul_artileriei_rom%C3%A2ne.jpg
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