How To Calculate Degrees Of Freedom For Independent T Test. Consequently, assuming equal population variances, the degrees of freedom are: Read on to learn more about this topic and to understand why this formula gives the correct number.

\[t = \frac{m}{s/\sqrt{n}} \] where, m is the mean differences; The number of degrees of freedom refers to the number of independent observations in a sample minus the number of population parameters that must be estimated from sample data. If s 1 happens to be equal to s 2 and n 1 = n 2 = n, this reduces to 2 ( n − 1) = 2 n − 2, i.e.