Answer:
Experimental group
Explanation:
Experimental group: In a psychological experiment, the experimental group is also referred to as the treatment group, because the experimental group is the one that receives a treatment in a given experiment. The term group refers to the test subjects including animals, human beings, plants, etc whereas the treatment refers to the variable a researcher is studying.
In the experimental group of an experiment or research, the independent variable is believed to be changed.
In this experiment, participants receiving drug Y constitute the experimental group.
