To test the null hypothesis that a set of sample data is normally distributed,we compare an expected normal distribution of the data to an observed distribution of the data.

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To test for normality, we typically compare the observed distribution of the data (e.g. histogram) to a normal probability plot or a theoretical normal distribution using statistical tests such as the Shapiro-Wilk test or the Anderson-Darling test.

To Test the Null Hypothesis That a Set of Sample