III. In the following example, the n = 20 employees (who lost there jobs when their company went bankrupt) were able to find employment within a two year period. The table below gives their previous salary X (in 1000$) and the salary of their new employment Y (in 1000$).

a) 70 b) 70 60 C) 60 70 50 50 60 40 40 50 30 30 40 20 30 20 10 20 10 0 10 0 0 10 20 30 40 50 60 10 20 30 40 50 0 60 0 10 20 30 40 50 60Employee 2 3 4 5 6 7 8 9 10 Previous Salary X (1000$) 43.3 35.1 35.1 32.6 30.5 43.1 40.2 43 37.1 38 New Salary Y (1000$) 40.6 17.3 22 20.8 37.4 43 37.6 59.1 42.7 29.8 Employee 11 12 13 14 15 16 17 18 19 20 Previous Salary X (1000$) 39.0 22.6 19.8 43.9 45.0 32.1 55.6 27.3 45.7 56.7 New Salary Y (1000$) 50.9 37.0 23.0 23.2 46.8 33.6 49.3 34.5 46.8 58.2 Note: n =20, Ex = 765.7, Zy = 753.6, Ex2 = 31021.43, Zy2 = 31274.42, Exy= 30180.25