using a sample of 1801 black individuals, the following earnings equation has been estimated: ln( earningsi) = 7.059 + 0.147educ + exp -0.201 female (135) (0.008) (0.007) (0.036) R2 = 0.179, n = 1801 a) Interpret the coefficient estimate on female. In answering parts b) and c), you must write down: (i) the null and alternative hypotheses; (ii) the test statistic; and (iii) the rejection rule. b) Test the hypothesis that there is no difference in expected earnings between black men and black women at the a = 0.05 level. c) Dropping exp and female from the regression gives: In(earnings) = 6.703 + educ (0.182) (0.012) R = 0.153, n 1801 Are exp and female jointly significant in the original equation at the a = 0.05 level?