## statistics

Why a positive test result doesn't necessarily mean you have the disease.

Why a DNA match doesn't necessarily prove your guilt.

Opinion polls, election forecasts, testing new medical drugs — none of these would be possible without the central limit theorem.

David Spiegelhalter's new book *Sex by numbers* takes a statistical peak into the nation's bedrooms. In this interview he tells us some of his favourite stories from the book.

David Spiegelhalter's new book *Sex by numbers* takes a statistical peek into the nation's bedrooms. In this interview he tells us some of his favourite stories from the book. Read the article or watch the video!

This year's PISA results have caused predictable headlines, but do the statistics add up?

In the previous article we looked at a psychological study which claims to provide evidence that certain types of extra-sensory perception exist, using a statistical method called significance testing. But do the results of the study really justify this conclusion?