Inwage = 4.7351 + 0.0801 educ + 0.0893 exper - 0.0024 exper - 0.1359 south - 0.1590 black (0.0796) (0.0041) (0.008) (0.0004) (0.0177) (0.0237) n=2,215 R2= 0.2373 SSR= 326.0507 Model (1) contains an indicator for Southern states, south, test that this group has different slope coefficients to the pooled model (1) to 5% significance. Does this suggest the Southern states should be modelled separately, or not? Is the unrestricted model in this question superior to the model estimated in (ix)