Is an investigation in which a group that receives some experimental treatment is compared to a group that does not receive the experimental treatment.?
An investigation in which a group that receives some
experimental treatment is compared to a group that does not receive
the experimental treatment can be called a placebo-controlled study
or a comparative experiment, both of which are types of clinical
studies. The group receiving the experimental treatment is called
the treatment group, and the group that is not receiving the
experimental treatment is called the control group.