Select the appropriate study design to test the hypothesis that high caffeine is associated with an increased risk of anxiety among Health students from UTH:
a. Experimental studies
b. Quasi-experimental studies
c. Observational studies
2) Using caffeine (risk factor) and anxiety (disease) as your exposure and outcome respectively briefly state how you will conduct a case-report or a case-series study to test the hypothesis in question 1.
3) Complete the following 2 by 2 table using the numbers from the Health class survey assuming that the total number of participants in the Health class = 28. Do not put less than 5 in any group.