A researcher gives the experimental group ginkgo biloba and the control group a placebo. In this example, what the groups receive is the ______ variable.
A) sample
B) independent
C) dependent
D) experimental

Question

Quizplus · Accepted Answer

The independent variable is the variable that is manipulated or changed by the researcher. In this case, the experimental group is given ginkgo biloba, while the control group is given a placebo. Therefore, the independent variable is the substance being given to the two groups.

A Researcher Gives the Experimental Group Ginkgo Biloba and the Control