In such cases the Distribution Calculator offers a reliable solution. The user simply enters the degrees of freedom, the test statistic or the level of signifance, and the program calculates the probability or the test statistic, respectively. The Distribution Calculator offers calculations for the normal distribution, the t distribution, the chi-square distribution, and the F distribution. As can be seen from the screen shot you may select for one-sided or two-sided tests. The probabilities beyond the critical values are colored in red.
via vias.org
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