I'm applying for a Ph.D. program in Sociology for Fall 2019. My background is in Computer Science, but I've attempted to build a competent resume by taking courses in my intended field and having relatively good grades in my non-major courses (philosophy, research methods, writing, etc.).
My query is related to writing samples. NYU requires a writing sample that, at maximum, should be 30 pages. While I have some great papers I wrote while at college, I'm wondering what it means to have a writing sample in your Ph.D application.
Do you write a sample from scratch, or do you simply make some changes to a paper you wrote in college? Are these samples supposed to be reviewed by a professor? If I write one from scratch, what's the recommended amount of time I should spend on it? I'm not looking to submit any applications before October, but not later than that, so I have about 4 months to write one and edit it.
Any advice would be useful. Thank you so much!