Professor milton wants to examine the relationship between brain damage and intelligence levels in adults. she wants to know whether brain damage has any relation to intelligence and, if so, what the extent of this relationship is likely to be. which of the following psychological research methods is likely to be most suitable to professor milton’s needs?
a. case study
b. survey
c. correlational research
d. experimental research

Correlational research          

Explanation:

Correlational research: This is one of the widely used non-experimental research techniques, in which the experimenter measures two different variables, assess and apprehend the statistical relationship between the variables without being influenced by the extraneous variable.

The research is often used in psychology, as a method of collecting information about a particular topic or any situation where experimenting is difficult.