We recently saw the A-Z compliance auditing. I thought I saw a chart that illustrated sample sizes. For example, if population is between 0 - 500 then pick x files. Can someone tell me if something like this exists?

That chart was from the FRB's Consumer Compliance Handbook and was re-stated in the Q&A materials after the webinar. Also referenced, since that is not available online, was the OCC's Sampling Methodologies which contains some formulas as well. It is available on their site.

Here is OTS' guide, I am sorry I couldn't post a direct link (at home, PC stinks), but click on the 201 link (Interagency Fair Lending Exam Procedures) they also have sampling guidelines. Come to think of it, it may be identical to the one that Andy referenced.