The hotel's lunch menu included roast chicken, roast beef, and a vegetable pasta dish. Because some of the people who became ill were vegetarian, there was particular interest in determining whether the pasta dish might be contaminated. At the time of the report, health officials were still looking for the source of the outbreak. The hotel was cooperating in the investigation and had voluntarily halted food service for the time being. When they did a screening test for gallbladder disease was completed there were 359 true positives and there were 180 true negatives. Explain why you might consider this problem important enough to investigate. Give at least three reasons for investigating.