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The accompanying data file contains 20 observations on the response variable y along with the predictor variables x1 and x2 Click here for the Excel Data File a. Estimate a regression model with the predictor variables x4 and X2, and then extend it to also include the interaction variable *1*2. What is the estimated regression coefficient for the predictor variable xi and x2 in both models? (Negative values should be indicated by a minus sign. Round your answers to 2 decimal places.) X1 X2 ces Model 1 (No Interaction) Model 2 (Interaction) b-1. Which is the preferred model for making predictions? since it has the b-2. Use the preferred model to predict y. (Round coefficient estimates to at least 4 decimal places and final answers to 2 decimal places.) Predictedy Predictor Variables *4 = 30, 210 *4 = 30, X2 = 20 9 3 2 2 2 40 1 Time_Per_Unit Unit_Number 2 18.70 7 3 17.40 9 4 12.90 10 5 11.50 11 6 10.20 18 7 9.00 21 8 9.20 23 9 8.50 28 10 8.40 29 11 8.10 31 12 8.20 35 13 7.90 14 6.80 41 15 6.90 44 16 7.00 48 17 7.40 52 18 6.80 54 19 6.50 57 20 6.50 61 21 6.60 65 22 6.30 66 23 6.40 71 24 6.30 75 25 5.70 76 26 6.10 83 27 5.80 86 28 5.60 88 29 5.80 93 30 5.80 98 31 5.40 102 20 mm 1 D 1 y X1 x2 2. . 37 33 22 32 3 51 35 25 4 30 57 42 5 28 22 17 6 7 28 87 64 21 34 27 9 8 9 33 19 30 10 28 34 28 5 11 12 13 52 50 56 31 50 38 21 32 12 21 28 14 15 16 13 84 4 5 6 7 16 44 34 23 28 29 -7 54 15 31 -8 -9 22 35 29 13 22 14 0 66 26 1 72 38 21