# Thread: Quick hypothesis testing question

1. ## Quick hypothesis testing question

What's the probability of not rejecting $H_0$ given $H_0$ is true?

Is it 1- alpha or 1-beta? I wrote 1-beta on my exam and now I'm pretty sure that it's 1-alpha

2. $\mbox{P(reject H_0 | H_0 \;is \;true)} = \mbox{type I error} = \alpha$

$\mbox{P(do not reject H_0|H_0 \;is \;true)} = 1-\alpha$

3. Darn, that's what I thought. I have Bo idea my I put the other answer down. Thanks