Can you help me find the answers for the question below?

D G H Write research and null hypothesis for the following researches a. To test the differentiated effects of food supplement on blood pressure hypertensive subjects, they were randomly given grapeseed, herbalife, pollenbee on two successive months and were asked to report after two months their blood pressure b. 100 males and 100 females views on divoce C. A study was conducted to compare the sociability of mentally gifted and average school children. O d. A researcher wanted to find out whether farmers and fisherman differ in their socio-economic aspiration