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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.
3. What is the difference between Inference and Observation. What is an Observation. Observation is the act or process of paying close attention to something or someone in order to gain information. Observations are made using our five senses: sense of sight, smell, hearing, taste, and touch.