The Chi-Square, Represented by X², Is Expressed by Which of the Following

Multiple Choice

The chi-square, represented by x², is expressed by which of the following:

A) $X^{2}=\sum \frac{\left(f_{0}-f_{e}\right) ^{2}}{f_{0}}$
B) $X^{2}=\sum \frac{\left(f_{0}-f_{e}\right) }{f_{e}}$
C) $X^{2}=\sum \frac{\left(f_{0}-f_{e}\right) ^{2}}{f_{e}}$
D) $X^{2}=\sum \frac{\left(f_{0}-f_{e}\right) }{f_{0}}$