An experiment isolates and manipulates the independent variables to observe its effect on the dependent variable

An experiment isolates and manipulates the independent variables to observe its effect on the dependent variable, while also controlling the environment so extraneous variables may be eliminated or held constant across experimental and control groups. While correlational research only identifies variables and looks for a relationship between them. This means that an experiment can determine cause an effect, but correlational research can only predict a relationship, and point to possible causation, because of the extraneous variables that may be involved and not known about.

In a single blind procedure, only the experimenter knows who is in the control group versus the experimental group, while in a double blind procedure, neither the experimenter nor the participants know who is in which group.