I was always under the impression that students who go to out of state college (some are because this is where they got accepted) will go and claim in state tuition after living the minimum (I think 1 year in most states) because they become residents of this state. So you basically pay the out of state tuition for the first year then in state after that. But the housing and food plans at most university (which is usually forced on first year students adds up to be an expensive).
No. Exact rules depend on the state, but most states don't consider students to be residents for tuition purposes just because you live there for a year. They look at other factors like where your parents live, where you pay taxes, whether you own real estate there, etc.