An office manager wonders whether there is any relationship between drinking coffee before 10 am and alertness. He selects at random 3 days of the week, and in those days, he compared the alertness level of 25 employees who usually drink coffee before 10 am and 25 employees who do not usually drink coffee before 10 am.
Is this an observational or experimental study?

This is an Observational study. An office manager wonders whether there is any relationship between drinking coffee before 10 am and alertness. He selects at random 3 days of the week, and on those days, he compared the alertness level of 25 employees who usually drink coffee before 10 am and 25 employees who do not usually drink coffee before 10 am. This is a perfect example of an observational study.

What is an observational study vs experimental?

The researcher just makes an observation in an observational study before drawing a conclusion. The researcher manipulates every component of an experiment in order to draw a conclusion. There is no experimentation done during observational research. In this kind of study, the researcher is more dependent on the data gathered.

An observational study is one in which researchers examine the outcomes of a particular intervention, risk, diagnostic test, or treatment without trying to control who is exposed to it or is not.

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