4. Given the values in below table for the independent variable x and dependent variable y: X y X y -1 7 1 5 -1 3 1 8 -1 6 1 12 -1 6 1 8 777 -1 7 1 6 -1 4 1 8 -1 2 1 9 (a) Perform the linear regression of y on x. Test Ho: 1 = 0. (b) Note that half of the observations have x = -1 and the rest have x = 1. Does this suggest an alternative analysis? If so, perform such an analysis and compare results with those of part(a).