An experiment is usually preferred to an observational study because
A) one can draw a cause and effect conclusion in an experiment but not in an observational study.
B) it is easier to collect data from an experiment than it is from an observational study.
C) it is cheaper to run an experiment than it is to do an observational study.
D) volunteers can be used for an experiment but not for an observational study.

Question

Quizplus · Accepted Answer

Experiments allow researchers to control variables and manipulate conditions, enabling them to establish cause-and-effect relationships. Observational studies, on the other hand, do not involve manipulation of variables, making it difficult to infer causality.

An Experiment Is Usually Preferred to an Observational Study Because