What is the first step an epidemiologist takes in an epidemic investigation?
AConfirm the diagnosis
BIdentify the prone people
CIdentify the causative factors
DIdentify the cases
A group of 80 people is being studied to determine the effect of diet modification on cholesterol levels. To compare the mean cholesterol levels before and after the diet modification in this group, which statistical test should be used?
APaired t-test
BMcNemar test
CChi-square test
DWilcoxon signed-rank test
EIndependent t-test
Which study design is most effective for investigating rare adverse effects of a drug?
ACohort study
BCross-sectional study
CCase-control study
DClinical trial/experimental study
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