When performing the rank correlation test, one alternative to using Critical Values of Spearman's Rank Correlation Coefficient table to find out critical values is to calculate them using this approximation rs= =+v(t2)/(t2+n-2) where t is the t-score the t Distribution table corresponding to n-2 degrees of freedom. Employ this approximation to find out critical values of rs for the case where n=7 and a=0.05.
±0.669
±0.448
±0.569
±0.755