Exercise#1 The following contingency table shows the number of athletes who stretch before exercising and how many had injuries within a given year. Injury Total No Injury 295 Stretches 55 350 No Stretches 231 219 450 Total 286 514 800 a) Suppose that the association rule Stretches => No Injury is mined. Given a minimum support threshold of 30% and a minimum confidence threshold of 70%, is this association rule strong? b) Based on the given data, is injury independent of stretching before exercise? If not, what kind of correlation relationship exists between the two