Phoebe is conducting a study on youth violence that occurs in suburban playgrounds. she watches and listens to what is taking place and records the actions and statements that the youth make. this is an example of research.

naturalistic observational research

Explanation:

According to my research on different research methods, I can say that based on the information provided within the question this is an example of naturalistic observational research. This is defined as a research method where the researcher observes and studies a subject in it's natural environment without any interference. That way the behaviors and actions of the subject are as natural as possible, and in term so are the results of the observation.

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answer; a cost benefit analysis;