Statistics at Square One Ninth Edition T D V Swinscow Revised by M J Campbell, University of Southampton Copyright BMJ Publishing Group 1997 Contents Preface 1 Data display and summary 2 Mean and standard deviation 3 Populations and samples 4 Statements of probability and confidence intervals 5 Differences between means: type I and type II errors and power 6 Differences between percentages and paired alternatives 7 The t tests 8 The chi-squared tests 9 Exact probabilty test 10 Rank score tests 11 Correlation and regression 12 Survival analysis 13 Study design and choosing a statistical test

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