The method of studying multiple groups (e.g., different ages) at the same time is most appropriately described as which type of research?

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Cross-sectional research involves studying different groups at the same time to compare them. This is in contrast to longitudinal research, which involves studying the same group over an extended period of time. Cross-over, post hoc, and experience-sampling research methods are not appropriate for studying multiple groups at the same time.

The Method of Studying Multiple Groups (E