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Type I error

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A fault that occurs during traditional hypothesis-based testing.

It occurs when the null hypothesis is rejected -- even though the null hypothesis is accurate and should not be rejected.

This error can be thought of more simply as a "false positive".

In other words, you incorrectly you declare a test a winner -- even though there's not actually a statistically significant difference between versions.

A type I error is the opposite of a type II error.

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