The $${\chi ^2}$$-test is defined as
A. $${\chi ^2} = \frac{{\left( {{\text{O}} - {\text{E}}} \right)}}{{\text{E}}}$$
B. $${\chi ^2} = \frac{{\left( {{{\text{C}}_0} - {\text{E}}} \right)}}{{\text{E}}}$$
C. $${\chi ^2} = \frac{{\left( {{\text{O}} + {\text{E}}} \right)}}{{\text{E}}}$$
D. $${\chi ^2} = \frac{{{{\left( {{{\text{C}}_0} - {\text{E}}} \right)}^2}}}{{\text{E}}}$$
Answer: Option B
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