1.Patients with an unusual group of symptoms (let's call it syndrome X) have been showing up in area ERs during the past 6 months.It is not contagious, but some sort of environmental exposure is suspected, specifically pesticide ZZStop. You want to prevent more cases and therefore perform a case control study. 34 cases are contacted and another 120 are contacted from randomly selected patients at the ER during the same time period. Thirty of the cases had been working with ZZStop and only 7 controls. All other exposures they were asked about were similar between the 2 groups.

a.What can you conclude and why? (4 pts)(Show your work)

b.Is the risk of developing Syndrome X high if ZZStop is used? (1pt)

c.Why would a prospective cohort not work as well? (1pt)

d.Why would a retrospective cohort not work as well? (1pt)

e.Why would an ecological study not work as well? (1pt)

f.Why would a cross-sectional study not work as well? (1pt)

g.Why would a trial (randomized or not) not work as well? (1pt)