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Parametric Statistics

Parametric Statistics - Histogram No Skew(= 0 …some...

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Parametric Statistics Powerful (Precise, Accurate) … BUT…. Not Robust: must meet the following Assumptions o Sample size is sufficient o Data are independent of one another (taken care of with methodology) o Normal Distribution : data for each population (treatment) come from a bell- shaped probability curve (range of values and the probability of each occurring in a random sample)
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Unformatted text preview: Histogram: No Skew (= 0) …some say <2 No Kurtosis (= 0) …some say < 2 Normality Plot (ranked deviations vs. z scores) should be straight line Statistical tests for normality: Kolmogorov-Smirnov test , Shapiro-Wilks' W test , Lilliefors test o Equal variances among populations (treatment groups)...
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