Evaluate the Argument on Career Opportunities from XYZ College

The following argument is made by the XYZ College Admissions Board:

"In a recent survey, alumni of XYZ College reported that 85% of them had better job prospects and higher salaries within five years of graduating than their peers from other institutions. Therefore, we conclude that attending XYZ College significantly enhances a student's career opportunities compared to attending other colleges."

Write a critique of the argument presented above. In your critique, be sure to discuss the assumptions made in the argument and evaluate its overall effectiveness.