Naked Statistics: Stripping the Dread from the Data

Wheelan's book is a popular statistics primer for readers who survived a bad statistics class. He covers the fundamentals — distributions, correlation, regression, significance, sampling — with enough examples that the formulas become intuitions rather than formulas. The book is not deep but it is generous, and for a product director without a quantitative background it is the fastest path to an operational vocabulary. Read alongside Field for the narrative version and Poldrack for the contemporary, rigorous, free version. Use Wheelan to calibrate your suspicions about confident claims that begin with "the data shows".