I was able to find this site that compares average income by where students went to college.
CSU Stanislaus: $47,000 (early career), $90,300 (mid career) MIT: $81,500 (early career), $147,000 (mid career)
Early career is 0-5 years experience. Mid career is 10+ years experience.
https://www.payscale.com/college-salary-report/bachelors?pag...
Obviously, we can't say that prestige of college and income are causal but the correlation is definitely there.