Research studies into the intervention's effects on single individuals are called:

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Case reports are research studies that focus on the effects of an intervention on a single individual. They often provide detailed descriptions of the individual's condition before and after the intervention, and can be useful for generating hypotheses and exploring new treatments. Individual differences studies, cohort studies, and randomized controlled trials typically involve larger samples and are designed to examine the effects of interventions on groups of individuals.

Research Studies into the Intervention's Effects on Single Individuals Are