Probability of rejecting a null hypothesis incorrectly (i.e. when it is true); the probability of committing such an error is set by a researcher at the alpha level. Typical levels are 5 or 1 percent, termed the 0.05 or 0.01 levels, respectively.
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error (... unintentional mistake. 3. bias. See Type 1 error, Type 2 error, and measurement error.)