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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.
1 Understand the advantages and disadvantages of observational research compared to other research methods. 2  Understand the strengths and weaknesses in the validity of observational research findings. 3  Know what Direct Observation is and some of the main concerns of using this method.irst this Web Page will discuss the appropriate situations to use observational field research. Second, the various types of observations research methods are explained. Finally, observational variables are discussed. This page's emphasis is on the collection rather the analysis of data.