It reads like no one had any sense of how well they would do on the test. So people guessed they'd be slightly above average which is a good prior for a group o

It reads like no one had any sense of how well they would do on the test. So people guessed they'd be slightly above average which is a good prior for a group of Ivy league students. This lead to the lowest being "overconfident" and the best being "under confident". Designing good studies is hard.