The goal is to compare each college's average satisfaction score (on the subscale AS WELL AS item level) to the overall average satisfaction score. Additionally, I want to know if these score differ significantly. I have been using guidance from this link to calculate z-scores. However, I am not quite sure how to get beyond comparing each college to the other. I want to compare each colleges individual average scores to the overall average score for all colleges. Maybe z-scores aren't the answer?