Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Insufficient help for learning

On the whole, this textbook is poorly organized and contains a lot of frivolous information. There is often a lack of cohesiveness in explanations of the concepts and models. My professor's lecture notes were much better than this textbook. Granted, if you were to spend significantly much more time with the textbook like I did, you will eventually adapt to the authors' style, but the lack of clarity and cohesiveness in the explanations was mildly a debacle. Hours can be saved by simply going to your professor's office hours for questions.So, I would say save your greenback and invest your time more wisely than reading this textbook.