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Statistical significance is a characteristic of a statistic viewed in light of a null hypothesis and a given significance level. It reflects whether the statistic belongs to the rejection region (is statistically significant) or the acceptance region (is not statistically significant).

Statistical significance is a characteristic of a statistic viewed in light of an (implicit or explicit) null hypothesis and a given significance level. It reflects whether the statistic belongs to the rejection region or the acceptance region defined by the null hypothesis and the significance level. The statistic is then statistically significant or not statistically significant, respectively.