The later the class is in the day the lousier the students and the less inclined to learn. Can't expect a half-literate teenager to give you good ratings when t

The later the class is in the day the lousier the students and the less inclined to learn. Can't expect a half-literate teenager to give you good ratings when the class is about writing coherent English. That's an observable fact. But the abstract in the paper is talking about follow-on classes, not a section of the same course that's given on a different hour of the day.