If I wanted to study a person's behavior without intervening or changing him/her I would use which of the following studies? A: experimental and quasi-experimental
B: case study and cross-sectional study
C: naturalistic observation and true experiment
D:naturalistic observation and survey

To study a person's behavior without intervention, use naturalistic observation and survey.

To study an individual or phenomenon, experiments or observational studies can be used. While experiments require manipulation by the investigator, observational studies do not require intervention.

Naturalistic observation involves studying an individual or element in its natural habitat without any form of manipulation. Notes are taken of observed attributes.

Surveys entail simply asking questions about the person without any form of intervention. People who know the individual could be respondents. Surveying the individual might warrant bias.

We can thus conclude that naturalistic observation and surveys are ways to study a person's behavior without intervention.

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