Question

simply put, the difference between the people in the experimental group and the people in the control group is whether they:

○ are measured by the researcher.

○ receive the special treatment of interest.

○ are in a double - blind study.

○ are participating in the research.

Explanation:

In experimental research, the experimental group receives the independent variable (special treatment of interest), while the control group does not. The other options are incorrect: both groups are measured, participation in a double - blind study is not the defining difference, and both groups participate in the research.

Answer:

B. Receive the special treatment of interest.