When Performing a Rank Correlation Test, One Alternative to Using $$r _ { S } = \pm \sqrt { \frac { t ^ { 2 } } { t ^ { 2 } + n - 2 } }$$

Multiple Choice

When performing a rank correlation test, one alternative to using Table A-9 to find critical values is to compute them using this approximation: $$r _ { S } = \pm \sqrt { \frac { t ^ { 2 } } { t ^ { 2 } + n - 2 } }$$
where $t$ is the $t - s c o r e$ from Table $\mathrm { A } - 3$ corresponding to $n - 2$ degrees of freedom. Use this approximation to find critical values of $r _ { \mathrm { S } }$ for the case where $\mathrm { n } = 11$ and $\alpha = 0.01$ .

A) $\pm 0.685$
B) $\pm 0.411$
C) $\pm 0.726$
D) $\pm 0.735$