1) A 10-year long study has enrolled 1500 men and women who work for the New York MTA to study the association between prolonged exposure to noisy environments and theonset of hearing-loss. 2000 MTA administrative office workers were also enrolled as controls. Participants were chosen based on how many hours they are exposed to noisy environments (75 decibels or higher) and then followed in time to see if they develop hearing loss of any magnitude. After 10 years, they found that 47 of the office workers had developed hearing loss, and 158 of the workers in the noisy environment developed hearing loss.

1) Based on the information given above, what type of study design was used?

2) What is thebestmeasure of association used for this study design type?

3) Use the information above to make a 2x2 contingency table with proper labels for disease status, exposure status and totals.Fill in all numbers

4) Calculate the measure of association you indicated in question 2, showing all the steps.

5) Imagine you had to share the findings of this research with the workers, how would you explain your answer in part 4 so that it makes sense tothem?