This is awesome! The biggest threat to validity I see is that your process of filtering from 10 resumes to 1 interview could introduce a lot of bias; if people

This is awesome! The biggest threat to validity I see is that your process of filtering from 10 resumes to 1 interview could introduce a lot of bias; if people ignore other warning signs that would weed out the resume because an applicant went to a top school, then you're going to end up with more stinkers with that attribute in your interview pool and undervaluing it in your final analysis. I would not suggest that you go through and rate all the unaccepted resumes on the same scale and then regress against both "got an interview" and "got an offer" since that seems like a ton of work, but I think it would be the best way to resolve the threat. :-)