this one seems a lot harder than the last few because the answers did not include every aspect of the stimulus

Great catch! I couldnt stop debating between D and E and your comment makes a huge difference!

I know what I did wrong like it completely ties in with evaluating a hypothesis and phenomena through casual mechanism. However, applying like concepts to the question is so challenging. It's like all the lessons escape my brain when I try reading a problem. I'm gonna start taking these practice questions with my notes out.

i am upset with this

kevin answers it at the end of this page!

I think they are using the "some are not" B to implicitly show that ALL of A is NOT B. if you say all of A --> /B then, you are saying it is never possible. However, if we had just one A that is not B then it would work for the A ←s→ /B. For EXAMple, the UC Berkeley students live in Berkeley. And then we find out that one student moves to Oakland. Then we have some students who are not living in Berkeley. If you used the A--> /B then it would reflect that none of these students live in Berekely. I'm sorry if I explained this wrong, I gave it my best shot.

I was wondering the same thing. I'm assuming they put most are not to represent the very few (at least 0 to 49) because some can represent a greater range (1-100) which can be misleading.

Me too!