Which of the Following Best Describes the Number of Degrees $\mathrm { n } - 2$

Short Answer

Which of the following best describes the number of degrees of freedom used in a Chi-square test for a value of the population variance? A. $\mathrm { n } - 2$
B. $\mathrm { n } - \mathrm { k }$
C. $n - 1$
D. $\mathrm { n }$