The $\chi ^ { 2 }$ Goodness-Of-Fit Test Statistic, When There Are K Categories and M

Multiple Choice

The $\chi ^ { 2 }$ goodness-of-fit test statistic, when there are k categories and m parameters to be estimated from the sample data, has approximately a chi-squared distribution with $v$ degrees of freedom, where $v$ equals

A) m-k-1
B) k-m
C) k-m-1
D) m+k-1
E) k-m+1