Data

The data below are in (x,y) form with x representing height and y representing arm-span. Each line is one person's measurement of height, arm-span. 
70, 72
75, 73
71, 73
66, 55
72, 74
70, 70
70, 72
68, 69
70, 64
74, 70
65, 64
70, 70
65, 67.5
68, 66
68, 70
71, 66
65, 66
66, 66
67, 67.2
62, 60
60, 54
68, 69
60, 61
73, 72
61, 63