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95 per cent administered agreement allocated analysis of variance answer Appendix assess binomial distribution calculate cell cent level chapter column comparison confidence limits correlation coefficient curve degrees of freedom drawn drug E. S. Pearson effects equal equation estimate of variance example expect experiment experimental expression follows formula frequently give given groups hence histogram indicate instance investigation known level of significance mean score measure memory impairment ment mutually exclusive events normal distribution null hypothesis number divisible observed occur by chance octahedron over-all pairs population possible outcomes Prob(A probability problem Professor of Psychology proportion psychiatrists punched question questionnaire random sample randomly raters refer rejection area relatively reliability sample means scale standard deviation standard error statistician studies subjects sum of squares symptom Table tail tend test of significance treatments tumours unbiased variables variation weights wish to compare z-value zero