The accompanying data file contains 20 observations on the response variable y along with the predictor variables x and d. Click here for the Excel Data File a. Estimate a regression model with the predictor variables x and d, and then extend it to also include the interaction variable xd. W is the estimated regression coefficient for the predictor variable x in both models? Note: Negative values should be indicated by a minus sign. Round your answers to 2 decimal places. 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. Note: Round coefficient estimates to at least 4 decimal places and final answers to 2 decimal places. Predictor Variables x-20, d, 1, d₂-0 x-20, d. 1, d2-1 Predicted y

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