1. Choose the study design that best matches each measure of disease frequency or association listed below. The study design may be used more than once or none at all. (10 points)

Measure of association	Study Design
____ Prevalence Rate Ratio	Case-Control
____ Incidence Rate & Incidence Density (without intervention)	Cross-sectional
____ Odds Ratio of Exposure	Ecological
____ Relative Risk in treatment vs control group	Cohort
____ Prevalence of Disease (snapshot)	Randomized Clinical Trial
____ Relative difference between treatments
____ Correlation Coefficient
____ Prevalence Odds Ratio
____ Odds Ratio of Disease
____ Rate Ratio & Risk Ratio (without intervention)