Consider the following economic model describing workers' earnings: In(earning) = B + 8 female + Bage + B educ + B age.female + 0 female educ + page With all the variables described as follows: In(eaming) = log of worker's earning: female = 1 if worker is female, and 0 if male; educ = years of schooling; age = age of the worker; age = age age female.educ is an interaction variable equal to female *educ; age.female is an interaction variable equal to age fomale