Sprint went on the offensive Thursday and endorsed a study (below) challenging AT&T's claims that buying T-Mobile would create jobs. The 'independent' study, handled by UC Irvine Economics professor and Center for Economics and Public Policy director David Neumark, rejected the idea that the capital investments made by AT&T would lead to more jobs after a merger. Neumark claimed that too much of AT&T's argument centered on the $8 billion it would invest into the combined network, which depended mostly on the assumption that T-Mobile would spend less than that amoun