Consider again the post-1960 trend in U.S. GDP we examined in Exercise 57. Here are a regression and residual plot when we use the square root of GDP in the model. Is this a better model for GDP? Explain. (Data in GDP and DJIA 2017) Response variable is: 2GDP

Exercise 57

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Response variable is: VGDP R squared = 99.4% R squared (adjusted) = 99.4% s = 0.0554 with 57 - 2 = 55 degrees of freedom Variable Coefficient SE(Coeff) t-ratio P-value Intercept -83.2810 0.8867 -93.9 <0.0001 Year 0.043374 0.0004 97.2 <0.0001