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Unformatted text preview: normal probability plot has heavy tails and the density plot isn’t evenly distributed around 0. SAMPLE SIZE = 25 This studentized form of the sample mean does appear to have a normal distribution. 3. df = 4 df=24 4. mean<mean(react) mean [1] 0.7964072 sd<sd(react) sd [1] 1.877763 The data set doesn’t look normally distributed. The mean does somewhat different from zero. (mean(react)0)/(sd(react)/sqrt(335)) [1] 7.762772...
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 Fall '06
 Bates
 Statistics, Normal Distribution, Victoria Yakovleva, 311 w, standardized sample mean

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