For each X-Y data set (n = 12): Data Set (a) X 64.7 25.9 65.6 49.6 50.3 26.7 39.5 Y 5.8 18.1 10.6 11.9 11.4 14.6 15.7 56.0 90.8 35.9 39.9 64.1 4.4 2.2 15.4 14.7 9.9 Data Set (b) X 55.1 59.8 72.3 86.4 31.1 41.8 40.7 36.8 Y 15.7 17.5 15.2 20.6 7.3 8.2 9.8 8.2 42.7 28.9 13.7 11.2 24.8 16.2 7.5 4.5 Data Set (c) X 53.3 18.1 49.8 43.8 68.3 Y 10.2 6.9 14.8 13.4 16.8 30.4 9.5 18.6 45.8 16.3 16.4 34.0 56.7 1.5 11.4 60.3 29.3 10.9 19.7 (b) Use Excel to calculate the sample correlation coefficient for each data set. (Negative amounts should be indicated by a minus sign. Round your answers to 4 decimal places.) Data Set (a) Data Set (b) Data Set (c)