It looks like you're using Internet Explorer 11 or older. This website works best with modern browsers such as the latest versions of Chrome, Firefox, Safari, and Edge. If you continue with this browser, you may see unexpected results.
Your browser is unsupported
We recommend using the latest version of IE11, Edge, Chrome, Firefox or
Safari.
This PDF guide is not a lesson in statistics. It provides the questions to ask and identifies the pitfalls to avoid, helping us get behind news stories using statistics. Created by the group Sense About Science.