The degrees of freedom for a t test of the difference of population means in a matched pairs experiment is samples is n1 - 1, because n1 = n2.

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In a matched pairs experiment, the samples are dependent and each pair is treated as a single unit. Therefore, the degrees of freedom for the t test would be n-1, where n is the number of pairs. Since n1 = n2 in this scenario, the degrees of freedom would be (n1+n2)-2, which simplifies to n1-1.

The Degrees of Freedom for a T Test of the Difference