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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 is a fundamental aspect of all scientific research. Scientists learn and develop concepts through observing the environment, people, animals, things, and how they affect each other. There are two types of observation: quantitative observation and qualitative observation. They are either used separately or together using a variety of tools necessary for the gathering and measurement of data.