Experimental studies are meant to -
Experimental studies involve an active attempt to change a disease determinant or the progress of a disease and are similar in design to experiments in other sciences. The major experimental design is randomized control trials. Field trials and community trials are other experimental studies. (refer pgno:63 park 23 rd edition)
Test etiological hypothesis
Find out prevalence rates
Find out cause of epidemics
To find out the history of disease
Epidemiology