How many degrees of freedom do we use for the chi square goodness of fit test?
A) k, where k represents the number of classes/categories.
B) k - 1, where k represents the number of classes/categories.
C) k - 1, where k represents the number of data values.
D) k, where k represents the number of data values.

Question

Quizplus · Accepted Answer

We use k-1 degrees of freedom for the chi square goodness of fit test, where k represents the number of classes or categories. This is because once we have chosen a certain number of frequencies to fit the expected distribution, the remaining frequencies are determined by the sum of the already chosen frequencies, so we lose one degree of freedom.

How Many Degrees of Freedom Do We Use for the Chi