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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.
The difference between observation and data is that observation is whatever you noticed happening such as, something dissolved or changed form or melted. Data is what ever measurements you made or took. Data is the actual information but observation is what you are seeing not whats actually involved. This question is archived.