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Applying Chi-squared to A/B Tests

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You've got data from online users that compares two alternatives. How can you tell whether there is a real difference? Statistical tests, like the CHI-squared test, tell you whether the behavior you observed was likely to have occurred by chance, or whether there's likely to be a real difference between the designs. A/B experiments like these are becoming increasingly popular in industry because experiments help you test your assumptions.

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