A study comparing representative groups of people of various ages on a particular dependent variable is called a:

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A cross-sectional study compares representative groups of people of various ages on a particular dependent variable at a single point in time. Longitudinal studies follow the same group of people over a period of time, usually years, to observe changes in the dependent variable. Epidemiological studies investigate the distribution and determinants of health and disease in a particular population. Field studies take place in a natural setting rather than a laboratory.

A Study Comparing Representative Groups of People of Various Ages