Karma Rei
Psychology and Sociology are sciences but they are soft sciences. From my best understanding hard sciences (like Biology, Chemistry, etc.) are sciences that can prove things. For example, water will always equal HOH. Sociology and Psychology can never prove anything. (Don't let people fool you and say that it can.) It can, however, find statistical probabilities. They still have to use the scientific method to test things.
Neither Sociology nor Psychology are meant to prove anything. I don't think anyone has ever claimed something of that nature. In fact, the methods of determining the statistics has nothing to do with the soft sciences and everything to do with mathematics. A statistician would preform that kind of work. Don't get me wrong, I can go along with the concept of sociology as a soft science (I think I actually referenced it as that earlier) - but if one is using the scientific method, its rather difficult to dismiss something entirely as a science. Proof, I believe, usually resides in the realm of mathematics, rather than in the hard sciences. We simply don't prove things in hard sciences - it isn't scientific to do so!
To those of you who haven't take a course on it, I approached sociology with my nose in the air, having focused on the hard sciences (started with physics, but finished my degree with mathematics) - and I must say its a hell of an interesting class. The class on the intro level would be an overview of society and social interactions. I do think that having a strong mathematical background is what made me enjoy it but there are many facets to the course.