Tyesha found that the z-statistic was 2.1 and that the critical z-values were -1.96 and 1.96. which of the following is a valid conclusion based on these results?

falls outside the region , which suggests that is the rejection region for a hypothesis at a 5% significance level. (We know this because .) Because falls in the rejection region, presumably this means you are rejecting some null hypothesis. But it's difficult to say for certain without any more information.