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The key difference between experimental and observational study is that an experimental study is a study where the researcher has control over most of the variables. On the other hand, an observation study is a study where the researcher merely observes the subject without controlling any variables.
Observation Methods. by Saul McLeod published 2015. Observation (watching what people do) would seem to be an obvious method of carrying out research in psychology. However, there are different types of observational methods and distinctions need to be made between:Controlled Observations.Natural Observations.y Saul McLeod published 2015. Observation (watching what people do) would seem to be an obvious method of carrying out research in psychology. However, there are different types of observational methods and distinctions need to be made between: