![]() If you’re calculating a confidence interval, choose the significance level based on your desired confidence level: In certain situations, you may want to decrease your risk of Type I error by decreasing α, or decrease your risk of Type II error by increasing α. 05 column is highlighted in the table since it is the most commonly used significance level. If you conducted an experimental trial with 14 participants in the placebo group and 17 participants in the treatment group, thenĭf = 29 Step 3: Choose a significance levelīy convention, the significance level (α) is almost always.
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