Signing contract during interview?

Hi all,

I had an interview with a hospital that made me sign a paper that I assumed was a contract stating that if I was chosen for the new grad program it is a 2 year stay. During the interview the panel said to read over it and sign it. The bottom of the paper stated such as if I don't stay the full 2 year no recommendations would be given by the hospital, also you need written/verbal explanation to why you are leaving program

My question is that this is only the interview and I was given this paper to sign about the 2 year contract If chosen. During the interview I was a little confused because if they call me back next week if they decide to offer me a position in their new grad program that I can't decline the offer? Or will I have the ability to decline the offer?

If anyone can shed light on this,