Return to the child mortality example that we have discussed several times. In regression (7.6.2) we regressed child mortality (CM) on per capita GNP (PGNP) and female literacy rate (FLR). Now we extend this model by including total fertility rate (TFR). The data on all these vari- ables are already given in Table 6.4. We reproduce regression (7.6.2) and give results of the extended regression model belo