Naked Statistics is my current airplane-travel reading book. I am about half-way through.
This book is for non-mathematicians and shall we say non-science majors; in effect it is a "Statistics for Storytellers" treatise. But that also makes it good for folks who use statistics and must explain their results to non-statisticians. Wheelan takes pains to avoid any equations in the book, but there are few equations in the parts I read.
For folks who ever wondered, "How did they get that data?" or "How do they really know that with any certainty?" or "Can I believe what my doctor is telling me?" I think this book is helpful on many levels.
For folks who know statistics and want some ideas on how to convey messages to non-statisticians, this book will give them ideas, too.
It's all about market timing, uh, I mean rebalancing, uh, I mean opportunistic rebalancing, uh, I mean short-term opportunistic rebalancing due to a short-term change in one's asset allocation.