An individual who participates in a research study as a member of the treatment group is called a

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The term "subject" is commonly used to refer to an individual who is participating in a research study as a member of the treatment group. This term is more neutral than "guinea pig," which implies that the individual is being experimented on. "Participant observer" typically refers to a researcher who is also observing the participants, and "case study" typically refers to a specific research method rather than an individual who is participating in a study.

An Individual Who Participates in a Research Study as a Member