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Preface to the Second Edition
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accept the null active drug alternative hypothesis analysis of variance antitussive aspirin assessment binomial binomial distribution calculate cards cent Chapter clinical trials column contingency table course degrees of freedom diet difference divided entries error variance estimate expected number experiment experimental treatment f-test frequency give given greater hence highly significant individual observations inert tablets interaction large number Latin square less litters Low Dose main effects mean square measurements method morphine/codeine normal distribution null hypothesis number of observations number of patients one-tailed test outcomes patients improved placebo Poisson Distribution probability of getting probability of obtaining produced proportion of patients random allocation random numbers random sampling ranks rats reader regression reject the null Remainder response scale scores sequential procedures sets of observations simply standard error statistical subjects subtracting sum of squares Suppose Table A.5 test of significance tion total number total sum two-tailed test untied pairs variance ratio variation weight