The given paragraph is structured as a<em>cause and effect</em> paragraph. This type of paragraph explains why something happens. The occurrence that takes place is defined as the effect and the thing that causes it is the cause.
Here, we have two groups of students who perceived the same lecture in two completely different ways. This is the effect. What caused this is the way the lecturer was introduced. The students' expectations (cause) affected their opinion on the lecture, the final result (effect).
