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Standard Deviations

  1. 5 Ways to Make Web Analytics Data More Insightful

    As discussed in the previous tip, calculating standard deviation is an easy way to determine whether the change you see in absolute numbers is statistically significant, if your data falls outside of two standard deviations of the mean.

  2. How Valid Are Your Landing Page Test Conclusions?

    This corresponds to a statistical Z-score of 2, meaning that the number must fall within two standard deviations of the observed mean. Many landing page testers are surprised when the results of their initial test don't hold up if the test is rerun...