2) Empirical results of a study are given below with standard errors in the parenthesis. (S- Number of years of schooling; FDUM = 1 if the worker is a female and o otherwise; EXP - Number of years of experience; RDUM - 1 if the race worker is white and otherwise). WAGE = 205 +6.3 S -0.7 FDUM + 2.3 EXP +1.3 RDUM (3.65) (2.33) (0.23) (1.01) (1.11) a) (3 points) What is the causal effect of schooling on the wage rate? b) (3 points) Interpret the coefficient of FDUM in words. c) (3 points) Does the worker's race have any significant effect on their wage rate? If yes, how much