For which of the following methods might a researcher employ a number of techniques such as interviews, direct observations, and psychological testing?

Question

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A case study typically involves an in-depth examination of one individual or a small group of individuals. To gather a comprehensive understanding of the person(s) being studied, a researcher may use multiple techniques such as interviews, direct observations, and psychological testing. The other options (A, B, C) generally do not involve as much extensive data collection and analysis as a case study does.

For Which of the Following Methods Might a Researcher Employ