Which study is known for illustrating an example of participant observation?

The study conducted by Barker on the Moonies is well-known for its use of participant observation. In this research, Barker immersed himself in the environment of the Moonies, a religious group, to gain a deeper understanding of their beliefs, practices, and social dynamics. Participant observation allows researchers to gather insights by engaging directly with the subjects, which can reveal information that might not come up through other methods such as surveys or interviews. By observing and sometimes participating in the daily lives of the Moonies, Barker was able to collect rich qualitative data, providing an in-depth look at the group's social environment from an insider’s perspective.

The other studies mentioned do not primarily focus on participant observation. For example, Curtis’s study of Genie primarily dealt with a case study approach focused on language acquisition through extensive observation rather than participant observation. The 7UP longitudinal study utilized a structured format to track the lives of the same individuals over time, primarily through interviews rather than direct participation. Similarly, King’s study of student behavior may involve interviews or surveys that do not capture the immersive element characteristic of participant observation.