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

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

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