For an independent-measures ANOVA with n = 10 participants in each treatment condition,df_within = 9.

Name: For an independent-measures ANOVA with n = 10 participants in each treatment condition,df within = 9.
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The degrees of freedom within (df_within) for an independent-measures ANOVA is calculated as N - k, where N is the total number of observations and k is the number of groups. With n = 10 participants in each treatment and assuming k groups, df_within would be k(n - 1), not 9.

For an Independent-Measures ANOVA with N = 10 Participants in Each