单尾检验与双尾检验
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| 单尾检验与双尾检验 [2023/03/16 14:05] – 创建 hayase_yuuka | 单尾检验与双尾检验 [2024/03/26 02:22] (当前版本) – 李佳熠2 | ||
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| 如果检验是有方向性的，临界区域只分布在概率分布曲线的一段，我们将其称为**单尾检验**（one-tailed test）。 | 如果检验是有方向性的，临界区域只分布在概率分布曲线的一段，我们将其称为**单尾检验**（one-tailed test）。 | ||
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| + | Before conducting a hypothesis test, we must clearly specify the decision criteria, i.e., **the significance level**, also known as the alpha level, whose essence is a specific probability. In psychological hypotheses we generally use an alpha level of α = 5% or α = 1%, and the region formed by these extreme values is known as **the critical region**.When the sample mean falls in it, we consider the data to be inconsistent with the null hypothesis and therefore reject the null hypothesis. | ||
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| + | The issue of testing directions also exists in choosing the decision standard, if it is not in a certain direction, the two sides of the distribution curve are both critical regions, so it is also called two-tailed test. If the alpha level is α = 5%, then each critical region only includes 2.5% of the mean of population. | ||
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| + | If the test is directional, | ||
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单尾检验与双尾检验.1678975548.txt.gz · 最后更改: 2023/03/16 14:05 由 hayase_yuuka