(i) Below is data of the variables Y, X1, X2, X3 and X4. Test for the presence of multicollinearity.
Y 223.5 215 227.5 244.5 313.5 279 238 315.5 217 209.5
X1 2.63 2.55 2.58 2.72 2.63 2.67 2.63 2.67 2.63 2.61
X2 18.75 13.87 14.27 18.76 18.77 13.87 14.14 18.76 18.72 18.76
X3 13.87 12.83 13.16 15.19 13.92 14.42 13.83 14.5 13.87 13.64
X4 5.13 5.18 5.71 5.59 5.21 5.07 5.65 5.89 5.57 6.09
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