In Problem 11 in Chapter 4, the R-squared from estimating the model log(salary) = β0 + β1 log(sales) + β2 log(mktval) + β3profmarg+ β4ceoten + β5comten + u, using the data in CEOSAL2.CSV, was R2 = .353 (n = 177). When ceoten2 and comten2 are added, R2 = .375. Is there evidence of functional form misspecification in this model?