I am a big fan of the Dummies books. I bought a ton of them and managed to learn a lot of good stuff this way. The author, Stephen Nelson, covers this occasionally not so simple subject in a very user friendly way right in line with the Dummies series tradition.
Keep in mind what this book' s purpose is about. It is essentially an Excel manual specializing on a specific set of functions to conduct certain types of data analysis. It is not a book about statistical analysis or data analysis. The author teaches you how to use those functions and Excel capabilities, but he won't teach you much about data analysis and statistics. For that you will need specific statistics books written by statistics professors. This book instead is a "how to" guide written by a CPA. And, given the book's purpose that's just fine.
Also, before buying any such book make sure you really study the table of content. This is to ensure the book covers what you need to learn. Different books covering the same overall subject (using Excel to conduct data analysis) could very well cover a fairly different set of topics with not much overlap between them. This is because Excel has so much width to its capabilities, you can easily take it in different directions.
When I looked at the table of content, I noted that Stephen Nelson is huge on Pivot Tables. He probably wrote the only book on data analysis dedicating a full four chapters to Pivot Tables. That was fine with me since I really wanted to learn about them.
In any case, if the book's table of content covers what you want to learn on the subject this is a very good book.