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Quantitative Data v༇ DATA: Birth weight of 3,226 newborn babies v༇ Fitted Probability Model: Normal curve with µ = 3.39 Kg & σ = 0.55 Kg Departures from Normality v༇ Multimodality. More than one mode suggesting data come from distinct groups. Departures from Normality v༇ Skew ness: Lack of symmetry. v༇ Outliers. Unusual extreme values. Empirical Rule For Normal Curves about 99.7% within 3 sd v༇ Roughly 68% of the distribution is within 1 SD of the mean (i.e. between µσ and µ+σ). v༇ Roughly 95% of the distribution is within 2 SD’s of the mean (i.e. between µ2σ and µ+2σ). v༇ Roughly 99.7% of the distribution is within 3 SD’s of the mean (...
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 Fall '07
 Lv
 Normal Distribution, standard normal curve

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