Using the regression output provided, perform an F test at the = .01 level with the null hypothesis that none of the region dummy variables affect weight. . regress weight male NHW NHB Hisp Source | SS df MS Number of obs = 17,870 -------------+---------------------------------- F(4, 17865) = 480.33 Model | 4587204.1 4 1146801.02 Prob > F = 0.0000 Residual | 42653596.7 17,865 2387.55089 R-squared = 0.0971 -------------+---------------------------------- Adj R-squared = 0.0969 Total | 47240800.8 17,869 2643.72941 Root MSE = 48.863 ------------------------------------------------------------------------------ weight | Coefficient Std. err. t P>|t| [95% conf. interval] -------------+---------------------------------------------------------------- male | 30.30382 .7377186 41.08 0.000 28.85782 31.74982 NHW | 22.45789 1.862219 12.06 0.000 18.80777 26.10802 NHB | 34.43931 2.116341 16.27 0.000 30.29108 38.58755 Hisp | 14.15673 2.250146 6.29 0.000 9.746224 18.56723 _cons | 134.6863 1.850712 72.78 0.000 131.0587 138.3138 ------------------------------------------------------------------------------