In this task, you are given a question and answer options for that question. Using this information, you have to classify each text into different topics: medicine, nursery, psychology, chemistry, pharmacology, biology.
Q: Question: Experimental factorial designs or also called complex experimental designs:
Options: <0> They study the effect of an independent variable on several dependent variables. <1> They study the main effects of several independent variables and their possible joint effect or interaction. <2> They are inadequate if it is suspected that some of the study variables may have interaction effects. <3> They can dispense with experimental control techniques because of their complexity. <4> They are based on the application of all experimental conditions to the same group of participants.
A:
psychology