1. Suppose a researcher was studying wound infections after an emergency appendectomy. The participants in the study were classified by whether or not they had an emergency appendectomy and the presence or absence of a wound infection. Use the following table to answer the questions below.

	Outcome	Total
Had Emergency Appendectomy?	Wound Infection	No Wound Infection
Yes	18	134	152
No	3	4	7

a. How do you compute the risk of wound infection in those individuals who had an emergency appendectomy.

b. How do you compute the risk of wound infection in those individuals who had an emergency appendectomy.

c. How do you estimate the relative risk of wound infection among those who had an emergency appendectomy and those who did not have an emergency appendectomy.

d. How would you interpret the relative risk estimate?