Which type of study always involves an in-depth examination of one specific individual or a very small number of individuals?

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A case study always involves an in-depth examination of one specific individual or a very small number of individuals. Cross-sectional studies and longitudinal studies involve larger samples and examine trends or patterns over time. Quasi-experimental studies are a type of study that lacks a true experimental control group.

Which Type of Study Always Involves an In-Depth Examination of One