Which logical fallacy is used in the text?
Mom, I know you're upset that I went over my cell limit this month. The important issue here, though, is that I got an A on my algebra exam.

 - red herring: the use of a completely unrelated topic or idea
 - circular reasoning: an argument that supports a claim with the claim itself
The text argues that performance on an exam and cell phone usage are associated events. However, these two events are not actually related. This illustrates a type of logical fallacy known as a red herring.