Because longitudinal studies involve multiple measurements,they can be described as"movies"of the population,and are used by almost all small businesses that use marketing research.

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Longitudinal studies are indeed like "movies" of the population because they track changes over time, but it's not accurate to say they are used by almost all small businesses for marketing research. Many small businesses may not have the resources or need for such extensive research methods.

Because Longitudinal Studies Involve Multiple Measurements,they Can Be Described As"movies"of