Studentized t (Also called Q)
Number of means
df
p (two tailed)

This program calculates areas in the tails of the Studentized Range Distribution. First specify the value of the studentized range statistic (Q). Q is computed as follows:

Some programs compute the value of the studentized t by including a 2 in the denominator. If so, then you should multiply the t by 2.77 to convert it to Q.

Then specify the number of means in the experiment and the degrees of freedom (df). Click the "Calculate" button and the two-tailed probability will be shown .