“You” didn’t mean YOU in that sense- it’s like the papal “we”. The following sentence in my post said that the schools send out the surveys. The point remains the same. Do they send out the surveys to all of their students? Or to, as it said, a “representative sample“? Or is their definition of a “representative sample” simply the random students that happened to reply to the survey, and whether or not the information they reply is accurate. Any student could claim that they’re making tons of money, but no one‘s going to fact check it.