I started out with Statistics for the Behavioral Sciences by Gregory J. Privitera, which provided a fantastic introduction into the world of statistics; not to mention the author's powerpoint slides are very useful and well-organized. After that textbook, I read Experimental Design & Analysis for Psychology. IMO, this is the perfect book to crack open after getting your feet wet with one or more intro level stat courses. The reason being, Abdi takes a very mathematical approach and loves breaking everything down into formulas (#ScoreModel). It may seem a little daunting at first for those w/o a background in math but it's straightforward and once you get a peak at what's "under the hood," you'll have a better conceptualization of the material you thought you grasped in undergrad stats.
Highlights for me was being able to look at analyses through the lens of regression (e.g., ANOVA), constructing the score model from scratch (ch. 22), and coding experimental designs (ch. 15 and onward). Definitely check out the author's additional resources on his site.
Downsides are that there's a few errors and typos in the book. Make sure to consult the book's site for a list of them so you can keep a lookout. This shouldn't be regarded as a criticism but I wish Abdi continued on to multivariate analysis just b/c I enjoyed how he expounded and broke down these concepts into digestible bits and pieces. But alas, that probably would have meant doubling the length of the book.
tl;dr - Great stat book. Get into the math and make sure to check out additional online resources.