Welcome to our automated Critical Value Calculator, here you can estimate the critical value for one-tail and two-tail tests quickly. It works for any test that follows normal distribution i.e. Z-test. t-test, Chi-Square test, and F distribution test. Ways to reject or accept the Null Hypothesis There are two ways to assess in hypothesis testing whether there is enough data from the study to reject H0 or to accept H0. Comparing the p-value with a pre-specified value of alpha (α) is the most common way, where alpha (α) is the probability/likelihood of rejecting H0 when H0 is valid/true. However, the estimated value of a test statistic can also be contrasted with the critical value. In this article, we are going to discuss