у X1 X2 12 2 45 121 14 1 43 132 10 3 43 154 16 6. 47 145 14 7 42 129 19 8 41 156 21 8 32 132 19 5 33 147 21 5 41 128 16

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у X1 X2 12 2 45 121 14 1 43 132 10 3 43 154 16 6. 47 145 14 7 42 129 19 8 41 156 21 8 32 132 19 5 33 147 21 5 41 128 16 8 38 163 19 4 32 161 21 9 31 172 25 12 35 174 21 7 29 180 1) Define normal equations for the multiple linear regression (independent variables are X1, X2 and X3 2) Use matrices format to express the multiple linear regression (independent variables are X1, X2 and X3. Define Y (dependent variable as a vector), X (independent variables as a matrix), B (coefficients parameters as a vector) and E 3) Estimate the multiple linear regression coefficients (provide description about all steps).