Reddit mentions of What is a p-value anyway? 34 Stories to Help You Actually Understand Statistics

http://www.amazon.com/p-value-Stories-Actually-Understand-Statistics/dp/0321629302

Very good book that summarizes complex statistical ideas in an easy-to-understand manner. It doesn't show you the complex calculations... it tells you how to interpret statistical results in an intuitive manner. And perhaps more importantly, it highlights common statistical errors/fallacies/etc.

But, I don't think there is going to be much statistics on the MCAT. They aren't going to give you a bunch of data, ask you to pick the right log conversion to mold the data into a natural distribution, and then pick the right test to highlight statistical significance. But without understanding p-values intuitively, I think you are missing something when you attempt to read/digest many scholarly papers. Not to mention, it's good to be comfortable with the material.

I haven't read it, but there's a book written about what p-values are: https://www.amazon.com/p-value-Stories-Actually-Understand-Statistics/dp/0321629302