Answer:
Formal research methods
Explanation:
Formal research methods -
It refers to the research method , which uses the basic and traditional search sources and experiments , is referred to as formal research methods .
In this research method , the sample used is a random sample .
The research method involve the use of library as the source of information and some experiments to conduct the research .
Hence , from the given information of the question ,
The correct term is Formal research methods .
