Error probabilities You read that a statistical test at significance level $\alpha=0.05$ has power 0.78. What are the probabilities of Type I and Type II errors for this test?
Added by Peter R.
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A Type I error occurs when we reject the null hypothesis when it is actually true. The probability of a Type I error is denoted by α (alpha), which is the significance level of the test. In this case, α = 0.05, so the probability of a Type I error is 0.05. Show more…
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