In a one-way ANOVA with 30 participants, and the factor has 4 levels, the between subjects degree of freedom is 25.

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The between subjects degree of freedom in a one-way ANOVA with 30 participants and 4 levels of the factor is 3, not 25. The formula for calculating the between subjects degrees of freedom is (number of groups - 1) or (k-1), where k is the number of levels of the factor. In this case, the calculation would be (4-1) = 3.

In a One-Way ANOVA with 30 Participants, and the Factor