Seventeen patients with a history of congestive heart failure participated in a study to assess the effects of exercise on various bodily functions. During a period of exercise the following data were collected on the percent change in plasma norepinephrine (Y) and the percent change in oxygen consumption (X):

Subject X Y Subject X Y 1 500 525 10 50 60 2 475 130 11 175 105 3 390 325 12 130 148 4 325 190 13 76 75 5 325 90 14 200 250 6 205 295 15 174 102 7 200 180 16 201 151 8 75 74 17 125 130 9 230 420 On the basis of these data can one conclude that there is an association between the two variables? Let a ¼ :05.