My background is haywire ;-) I did engineering for undergrad and then a post graduation in management and worked in corporate for a few years. I had statistical courses and one course in industrial sociology during my post grad. Other than that, I think, the lack of back ground in sociology was a slight hiccup. What helped me was that I got myself research experience and thankfully it was in the area of my interest. This also got me some publications although not in peer reviewed journals. But I think, my SOP was in good shape, and was quite grounded and was based on my research experience. I also had clear research questions in my SOP. But then things could have been better. I applied to 8 schools and got admitted to one. I am still in waitlist for funding in one and waitlist for admission in another.