While I do think that interviewing is broken, I would love to see the raw data with this. For example, did Udacity courses have other related traits associate

While I do think that interviewing is broken, I would love to see the raw data with this. For example, did Udacity courses have other related traits associated with them, IE: did these candidates that also have a certain number of years of experience, degree etc.? 3000 is a small sample size and I'm wondering if there is some sampling bias here.