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Research is broadly defined as a systematic investigation with the aim of advancing existing knowledge. It is a process of rigorous reasoning which is based on theories, methods, and findings. It relies on the application of the scientific method and uses inquiries, observations, and ________________ to answer questions about the causes of different phenomena.

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The main method for secondary research is a systematic review with or without __________________, which is a statistical technique used to pool data from independent studies.

Human subject research in the social sciences often involves surveys which consist of questions to a particular group of people. Survey methodology includes questionnaires, interviews, and _____________________.

The United States Department of Health and Human Services [HHS, 32 C.F.R. 219.102(f)] defines a human subject as "a ______________________ about whom a research investigator (whether a professional or a student) obtains data through 1) intervention or interaction with the individual, 2) identifiable private information.

As defined by US HHS regulations: "Intervention" refers to ________________________ by which data is gathered and the manipulation of the subject and/or their environment for research purposes.