As the name suggests, this book provides essentials for statistics, and I find it very useful especially for my college statistics. This book covers both Statistic I and Statistic II (although it kind of went more to statistic II), and has a brief yet understandable explanations that most people could pick up if read carefully. However, as much as the plus side this is, this is not a replacement for statistics textbooks, and its much suitable for additional or supplemental reading (I for instance use this book for my Statistic II course for my college).
Very good book, I look forward to see the larger explanation version in Statistic I & II For Dummies , for I will further refresh myself into statistics as I will encounter more courses that are related to statistics.
Also, this book has a hints of Research Methodology, just a brief one.