Statistical FAQs

How do I interpret the Shapiro-Wilk test for normality?

The null hypothesis for this test is that the data are normally distributed. The Prob < W value listed in the output is the p-value. If the chosen alpha level is 0.05 and the p-value is less than 0.05, then the null hypothesis that the data are normally distributed is rejected. If the p-value is greater than 0.05, then the null hypothesis has not been rejected.

FAQ # 2085
Last Updated: 2004 Jun 25

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