For a goodness-of-fit chi-square test, the degrees of freedom are equal to
A) N - 1, where N is the number of observations.
B) C - 1, where C is the number of categories.
C) NC - 1.
D) ( N - 1)( C - 1).

Question

Quizplus · Accepted Answer

The degrees of freedom for a goodness-of-fit chi-square test are calculated by subtracting 1 from the number of categories (C) in the expected distribution. This is because once C-1 categories are known, the frequency of the last category is determined by subtraction from the total.

For a Goodness-Of-Fit Chi-Square Test, the Degrees of Freedom Are