Question

an experiment is a study in which some is deliberately imposed on individuals in order to observe their responses.

Answer 1

The purpose of an experiment is to study whether or not a treatment causes a change in the response.

"Deliberately imposing some treatment on individuals to measure their responses. ‐ When our goal is to understand cause and effect, experiments are the only source of fully convincing data" .  The validity of a experiment is directly affected by its construction and execution.

A factor of an experiment is a controlled independent variable; a variable whose levels are set by the experimenter. This is different from observational study "which involves collecting and analyzing data without changing existing conditions."

Thus experiment is the correct answer.

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