Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Are you kidding?

Naturally. probability and counting are difficult concepts to grasp. So therefore, let's make a book without answers in the back (ehm, what's the point of solving a problem if you don't have anything to check it against?). I'm rather surprised this comes out of an engineer.What I'm not surprised by is the explanations. They are like bombs. Basically, here's an equation, it works, use it (maybe that's how engineers work?). Why does it work? Derivation? Hello? Wherever there are actually explanations I would not consider them enough for a regular student to understand.I'm disappointed, this book is making my prob and stats course harder than it should be.