Put your answers in underneath each question below. You may use a calculator and the excel files, but no notes, no websites, no outside assistance. [50 points total/ 4 extra credit

points] Persian Gulf War Analysis Chronic Multisymptom Illness Cases Controls 327 708 1035 Veteran: Deployed Non-Deployed Total 1. The contingency table above shows the results of a study about whether there is an association between veteran deployment and the disease chronic multisymptom illness. a) Explain what is meant by "cases" and "controls"? [2 points] Total 492 1659 2151 165 951 1116 b) Which is the Explanatory variable? Which is the Response variable? [2 points] c) What proportion was deployed, of those in the study who had chronic multisymptom illness? [2 points] d) What proportion was deployed who did not have chronic multisymptom illness? [2 points] e) Extra Credit: Calculate the odds ratio and interpret. [4 points]