I need a solution to this problem

Question 1 Eighteen observations were obtained on four predictor variables and one response variable in a prowess. LEI .Xh .Xh .X 1' 2D 50 75 15 27 27 55 50 20 23 22 52 53 15 13 27 55 50 20 25 24 75 72 3 23 3D 52 73 13 27 32 79 71 11 30 24 75 72 3 23 22 52 53 15 22 27 55 50 20 24 4D 90 73 32 15 32 79 71 11 23 5D 34 72 12 31 4D 90 73 32 22 2U 5U 75 15 24 5D 34 72 12 31 30 52 73 13 29 27 55 50 20 22 It is suggested that the model Y = n + 51X] + ,32X2 + sxs + 54x4 + 11X12+ .512X1X2 + 522%? + ,BIBXI-XEI + 1314X1X4 + E is reasonable. 1. Examine the data and the model. Is it possible to t the proposed model to the data? Why or why,F not? 2. Determine an estimate of the variance of the random error, 02