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05 level aggressive analysis of variance Assumptions and conditions behavior central tendency chapter class interval column computed correlation coefficient critical value Decision rules degrees of freedom determine difference between means divided drug equal example experimental formula frequency distribution frequency histogram given grand mean graph group means independently sampled indicates interaction lower real limit mean square measurement median nondirectional test nonparametric null hypothesis number of scores number of subjects observed percentile point percentile rank population distribution population mean prediction probability procedures random sample randomly and independently ratio raw scores regression line reject H0 reject the null sample mean sampling distribution sampling error scale score value selected significance level squared deviations standard deviation standard error standard normal distribution standard score statistical test subtracted sum of squares Suppose symbolized Table tion total number treatment effects type I error Vicarious Reinforcement zero