Exhibit 11-1 A drug and a placebo are compared for treating diabetes.A random half of the subjects receive the drug,while the other half receives the placebo.Blood glucose level is tested in all of the subjects several times a day.
Refer to Exhibit 11-1.The independent variable in the experiment described is
A) the drug
B) the placebo
C) blood glucose level
D) not present

Question

Quizplus · Accepted Answer

The independent variable in this experiment is the treatment being administered, which in this case is the drug and the placebo. These two options are randomly assigned to half of the subjects, making them the independent variable being manipulated in the experiment. Blood glucose level is the dependent variable being measured. Therefore, both A) the drug and B) the placebo are the best choices for the independent variable(s).

Exhibit 11-1 a Drug and a Placebo Are Compared for Treating