The separates the region of rejection from the region of non rejection.

Critical Value

Step-by-step explanation:

The critical value separates the region of rejection from the region of non rejection.

We define critical values as:

Critical value helps us to give the decision rule for the rejection or acceptance of null hypothesis.Critical value separates the acceptance region from the rejection region.These are referred to as cut-off values that define regions where the test statistic is unlikely to lie.The critical value depends on the kind of test being performed and the significance level.

Understanding what? lol