3.2 The data in WAGE2.RAW on working men was used to estimat equation: SON LEANING OR CLASSRO educ = 10.36 - .094 sibs + .131 meduc + 210, n = 722, R = .214, where educ is years of schooling, sibs is number of siblin schooling, and feduc is father's years of schooling. meduc is mother's years of (i) Does sibs have the expected effect? Explain. Holding meduc and feduc fixed, by how much does sibs have to increase to reduce predicted years of education by one year? (A noninteger answer is acceptable here.) (ii) Discuss the interpretation of the coefficient on meduc. (iii) Suppose that Man A has no siblings, and his mother and father each have 12 years of education. Man B has no siblings, and his mother and father each have 16 years of education. What is the predicted difference in years of education between B and A?