Model Summary Adjusted R Std. Error of Model R R Square Square the Estimate 729 .532 498 258.33093 a. Predictors: (Constant), UnHappy, GNP ANOVA Sum of Model Squares f Mean Square F Sig. Regression 2122235.038 2 1061117.519 15.900 .001 Residual 1868576.317 28 66734.868 Total 3990811.355 30 a. Dependent Variable: Sales b. Predictors: (Constant), UnHappy, GNP Coefficients Standardized Unstandardized Coefficients Coefficients Model B Std. Error Beta Sig (Constant) 1340.641 204.582 6.553 000 GNP 335 060 726 5.611 000 UnHappy -56.680 110.974 -.066 -.511 614 a. Dependent Variable: Sales Above is output from a linear regression. The dependent variable is the number of cars sold (Sales). The independent variables are: GNP and a 0/1 variable for whether the country was in an unhappy mood (UnHappy=1 when country is unhappy. 0 when country is happy). How close is the model to perfect prediction? O 53.2% O 72.9% O 15.9% O 49.8%