This paper is designed to introduce students in the 16–19 group to Analysis of Variance. It takes as its subject a political-geographic issue, namely electoral districting, or gerrymandering. The topic of gerrymandering is outlined, and the distribution of boundaries for the 1979 EEC elections in London examined. Different gerrymanders are then explored, using Analysis of Variance to describe various types of solution, according to the distribution of the Labour vote both within and between constituencies.