The difference between an observational study and an experiment is that
in an observational study, only one group is studied, and in an experiment, two groups are studied.
in an observational study, the researchers do not control treatment, and in an experiment, they do.
in an experiment, cause-and-effect is analyzed, and in an observational study, it is not.
in an experiment, one group is studied over a short period of time, and in an observational study, the group is studied ove
a longer period of time.

The correct option for the difference is in an observational study, the researchers do not control treatment, and in an experiment, they do

What is an experiment?

An experiment is a technique that is carried out to support or reject a hypothesis, or to test the efficacy or probability of something.

The basic difference between an observational study and an experiment:

An observational research involves measuring or surveying members of a sample without attempting to influence them.
In an experiment, the decisions and the environment is controlled, and we divide people or items into groups and provide therapy to one of the groups while leaving the other group alone.

Hence, the correct option for the difference is in an observational study, the researchers do not control treatment, and in an experiment, they do.\

Learn more about Experiment:

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