Class Levels. Earlier in this section, we considered the political party affiliations of the students in Professor Weiss’s introductory statistics course. The class levels of those students are as follows, where Fr, So, Jr, and Sr denote freshman, sophomore, junior, and senior, respectively.

So So Jr Fr Jr So Jr So So So Sr So Jr Jr Sr Fr Jr Jr So Jr Fr Sr Jr So Jr Fr Fr Jr Sr So Sr Sr So Jr So Sr So So Fr So