What is a population?

A collection of items of interest in research. The population represents a group that you wish to generalize your research to. Populations are often defined in terms of demography, geography, occupation, time, care requirements, diagnosis, or some combination of the above. Contrast this with a definition of a sample. An example of a population would be:

• all infants born in the state of Missouri during the 1995 calendar year who have one or more visits to the Emergency room during their first year of life.

This work is licensed under a Creative Commons Attribution 3.0 United States License. It was written by Steve Simon on 2002-10-11, edited by Steve Simon, and was last modified on 2010-04-01. This page needs minor revisions. Category: Definitions, Category: Hypothesis testing.