Determine whether the description corresponds to an observat

Determine whether the description corresponds to an observational study or an experiment.

Twenty patients with Parkinson\'s disease are divided into two groups. One groupTwenty patients with Parkinson\'s disease are divided into two groups. One group

receives an experimental drug to fight palsy comma the other a placebo.receives an experimental drug to fight palsy, the other a placebo.

After one year commaAfter one year,

memory recall is measured.memory recall is measured.

Does the description correspond to an observational study or an experiment?

Solution

This is an EXPERIMENT, because the researcher altered some conditions for the patients. [ANSWER, EXPERIMENT]

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An observational study simply observes what is happening, it doesn\'t alter circumstances for the subjects in the experiment.