Research Article Statistics at square one. VI. Variation between samples. Br Med J 1976; 1 doi: https://doi.org/10.1136/bmj.1.6025.1585 (Published 26 June 1976) Cite this as: Br Med J 1976;1:1585 Article Related content Metrics Responses Peer review This is a PDF-only article. The first page of the PDF of this article appears below.