multiple regression

I’m really confused. question 7 practice problems for reading 12 p345. why was that a two tailed test. I would have thought its either or. either the returns are higher or they are not? help please.

sorry forgot to add that this is in the CFA program carriculum

The question asked differ; so better or worse. So it makes this a two tailed test. Not in this question but be careful that F test is one-tailed.

thanks for the feed back sherbeer