A study that is conducted over a long period of time with the same population is known as a(n)____________.

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A longitudinal study is conducted over a long period of time with the same population to observe changes or trends over time. An observational study is a type of research design where people (or study subjects) are observed or monitored in some way, while a cross-sectional study involves taking a snapshot of a population at a certain point in time. A mixed design study combines elements of different research designs, such as a combination of observational and experimental methods.

A Study That Is Conducted Over a Long Period of Time