5. Daily et al. state that the cumulative incidence rate for HIV diagnosis among those in the highest SVI quartile was 52.1 per 100,000 persons and among those in the lowest SVI quartile was 33.7 per 100,000 persons. (24 points)

a. Calculate the cumulative incidence (risk) difference for HIV diagnosis, comparing the highest SVI to lowest SVI quartiles. Round your answer to the first decimal place.

b. Interpret the cumulative incidence (risk) difference for HIV diagnosis obtained in Question 5A

c. Calculate the risk ratio for HIV diagnosis, comparing the highest SVI to the lowest SVI. Round your answer to the second decimal place.

d. Interpret the risk ratio obtained in Question 5c.