At the beginning of the 2009 Swine Flu (H1N1) pandemic, a local health department was notified of 14 cases of the virus that had developed in their district over a time period of one week. In hopes of preventing further spread of the virus and stopping it before it became a widespread outbreak, the health department launched an investigation into the source of the virus. In their study, they were able to enroll 40 individuals with the virus and 70 individuals without the virus. After interviewing all of the participants, they determined that of the cases, 35 had attended a concert at the local park during the week prior while 5 had not, and of the 70 controls, 30 were in attendance at the concert and 40 were not.

Does the odds ratio approximate the relative risk well? (1 point). Why or why not? (1.5 points). Assume that, even in an outbreak situation, the risk of acquiring H1N1 is relatively rare in the general population.