As for a book, what part of, "any introductory Statistics book," do you fail to comprehend? I haven't needed an introductory book for a decade myself, and I have no idea what the current offerings are. But they should all cover this.
If you're worried, ask your professor for a recommendation. After all that is what he is THERE for.
Gee, lots of them out there, I think I will put the names of them on a dartboard and throw darts at them, it would be more helpful than you've been to me on picking out a good book.
I have asked my instructor in email, and SHE, has been ignoring my questions. I even asked for a Syllabus, which is part of her job to give me one, and she refused to give me one. That was the only response I got. I asked nicely, I asked politely, and I explained to her the problems I had with the test. So far, nothing else from her except she said she would not give me a Syllabus.
Edit: I did a search on Amazon.com, interesting that books that use statistics in their descriptions come up, but are not actually about statitistics. One book was available for $100USD and the rest where out of stock. Do a search on "Intro to Statistics" and see what pops up. I'd use my college bookstore, but they outsourced it to a web company that sent me the wrong book, and ripped me off of $60USD and refused to refund my money. The college says they are looking into it for the past 3 months or so, but keep making excuses as to why I cannot get a refund or exchange.