In which of the following research methodologies, manipulation and control of variables and randomization of sample are 2 of the basic necessities..........
A. Ex-post facto research
B. Descriptive research
C. Case study research
D. Experimental research
Answer:D
In which of the following research methodologies, manipulation and control of variables and randomization of sample are 2 of the basic necessities..........
A. Ex-post facto research B. Descriptive research C. Case study research D. Experimental research