When a researcher meets with the research participants in her study and asks each of them a series of questions, altering the questions as necessary, which data collection method is she using?

Question

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The researcher is using an unstandardized interview, which involves asking a series of questions and altering them as necessary based on the responses of the participants. A researcher-administered questionnaire involves the researcher giving the participants a pre-defined set of questions to answer on their own, while a structured survey involves a standard set of questions being asked to all participants in the same way. A structured experiment involves manipulating an independent variable and observing its effects on the dependent variable.

When a Researcher Meets with the Research Participants in Her