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Highly Access Review

Statistics review 5: Comparison of means

Elise Whitley1 and Jonathan Ball2

Author Affiliations

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

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

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Critical Care 2002, 6:424-428 doi: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.

Keywords:
comparison of two means; paired and unpaired data; t test