Question

A designed experiment is described. Identify the specified element. 780 participants suffering from depression were randomly assigned to one of three groups. Over a four-month period, the first group received a low dosage of an experimental drug, the second group received a high dosage of the drug, and the third group received a placebo. At the end of the period each participant rated their mood on a scale of 1-5. Identify the treatments.

Answer 1

In an experiment, the factor (also called an independent variable) is an explanatory variable manipulated by the experimenter. Each factor has two or more levels, i.e., different values of the factor. Combinations of factor levels are called treatments. So as per this definition, in the given experiment treatments are as follows:

Placebo, low dosage of the drug, high dosage of the drug

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