Determine whether the study depicts an observational study or an experiment.

Twenty patients with leukemia are divided into two groups. One group is treated with an experimental drug. The other is not. After one month, both groups are questioned about their energy level.

Is the study an observational study or an experiment?

A. The study is an experiment because the researchers control one variable to determine the effect on the response variable.
B. The study is an observational study because the researchers control one variable to determine the effect on the response variable.
C. The study is an observational study because the study examines individuals in a sample, but does not try to influence the response variable.
D. The study is an experiment because the study examines individuals in a sample, but does not try to influence the variable of interest.

An experiment involves researchers applying a treatment to a group of subjects to observe its effect on an outcome variable. In this case, one group of leukemia patients received an experimental drug, while the other group did not, to measure the drug's impact on energy levels.

Observational studies, on the other hand, do not involve manipulating variables. Researchers in such studies observe naturally occurring phenomena without applying any treatments or interventions.

Comparing the groups based on the treatment given establishes the distinction between an experiment and an observational study.

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