For degrees of freedom greater than 30
A. $$2{{\text{x}}^2} - \sqrt {2{\text{v}}} - 1$$
B. $$\sqrt 3 {{\text{x}}^2} - 2{\text{v}} - 1$$
C. $$\sqrt 2 {{\text{x}}^2} - \sqrt {2{\text{v}}} - 1$$
D. $$2{{\text{x}}^2} - 2{\text{v}} - 1$$
Answer: Option C
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