Answer:
experiment
Step-by-step explanation:
Experiment: In psychology, the term experiment is defined as a method of investigation that underlies the hypothesis being scientifically tested.
In an experiment, generally, three different variables are being used including:
1. Dependent variable (the effect)- is measured.
2. Independent variable (the cause)- being manipulated or changed.
3. Extraneous variable- being controlled.
Advantage: An experiment needs to be objective.
In the question above, the given statement signifies the experiment.