Homework: Exercise 13.1 For each set of ordered pairs below, sketch the scatter diagram and estimate not calculate!) the correlation coefficient as positive, zero, or negative. X 3 6 12 18 24 10 55 70 90 100 X 3 7 15 35 60 40 35 30 25 18 X 5.2 7.3 6.7 5.9 6.1 3.3 5.9 4.8 4.5 4.0