^the above example is very biased: it’s one of the most popular classes at Yale and NOT a typical intro class! And anyway, you’d need to compare classes in subjects you’ll actually take, at all 5 universities you’re considering. Since you’ll get exemptions for Economics and math, but not for statistics, I suggest looking at the number of students in the required Statistics class, which you’d likely take your first semester, and in your foreign language class, at each of the universities.
You can compare the enrollment by looking at the schedule of classes online for Fall 2016.