Statistics review 5: Comparison of means

doi:10.1186/cc1548

Critical Care
Volume 6
Issue 5

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This article is part of a series on Medical statistics, edited by Jonathan Ball, Viv Bewick and Liz Cheek.

Review

Statistics review 5: Comparison of means

Elise Whitley¹ and Jonathan Ball²

¹Lecturer in Medical Statistics, University of Bristol, Bristol, UK

²Lecturer in Intensive Care Medicine, St George's Hospital Medical School, London, UK

Critical Care 2002, 6:424-428doi:10.1186/cc1548


Published:	12 July 2002

Abstract

The present review introduces the commonly used t-test, used to compare a single mean with a hypothesized value, two means arising from paired data, or two means arising from unpaired data. The assumptions underlying these tests are also discussed.