Final answer:
Experimental research aims to investigate the relationship between variables by manipulating an explanatory variable and observing a response variable.
Step-by-step explanation:
The purpose of experimental research is to investigate the relationship between variables. In an experiment, there is an explanatory variable that is manipulated by the researcher and a response variable that is observed. Experimental research is generally done by randomly selecting participants from a population and assigning them to different groups, with some participants not knowing their group membership to prevent bias.