Can my parents claim me as a dependent?

I was a full-time student for half of 2012 but lived away from home and provided more than half of my support. My parents tell me that they can still claim me because I was a full-time student, but my sister says they can't because I lived away from home and provided more than half of my support. I'm honestly not sure who to believe or go with. I feel like my parents are correct because while I provided more than half of my own support they are the reason I had the financial aid that I did. They also had to sign for the loans that had to be taken out for me to use to pay for college, so they are just as responsible for them as I am. Is this correct? Are my parents able to claim me on their taxes as a dependent?
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