Degrees of Freedom

one sample t test

N - 1

independent samples t test

N - 2

one sample t test

N - 1

independent samples t test

N - 2

dependent samples t test

N - 1

one way between subjects ANOVA IV

k - 1

one way between subjects ANOVA error

N - k

one way between subjects ANOVA total

N - 1

one way within subjects ANOVA subjects

n - 1

one way within subjects ANOVA IV

k - 1

one way within subjects ANOVA error

(n-1)(k-1)

one way within subjects ANOVA total

N - 1

two way/factorial ANOVA IV

kIV - 1

two way/factorial ANOVA interaction

(kIV1 - 1)(kIV2 - 1)

two way/factorial ANOVA error

N - k

two way/factorial ANOVA total

N - 1

correlation

N - 2

chi squared GOF

k - 1

chi squared independence

(R-1)(C-1)