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Testing for Normality using SPSS Statistics Introduction An assessment of the normality of data is a prerequisite for many statistical tests because normal data is an underlying assumption in parametric Testing for Normality using SPSS Statistics Introduction An assessment of the normality of data is a prerequisite for many statistical tests because normal data is an underlying assumption in parametric The normal probability calculator for sampling distributions gives you the probability of finding a range of sample mean values. Ideal for Check out the Normality & Molarity Calculator - this tool provides lab-ready directions describing how to prepare an acid or base solution of specified Molarity (M) or Normality (N) from a Calculate normality, equivalent weight, and solution concentration for acids, bases, and salts. Step-by-step The normality of a solution is the molarity multiplied by the number of equivalents per mole. 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