Or this is equivalent to being 2.34 standard deviations away from this mean of 0. So in order to reject the null hypothesis, that has to be less probable than our significance level. And to see that, let's see what the minimum z-score we need to reject our hypothesis. So let's think about that a second. I'll go back to my z-table. We want to have a significance level of 5%, which means the entire area of our rejection, the entire area in which we would reject the null hypothesis, is 5%. This is a two-tailed test.