Finding Critical r Values Table 6 in Appendix: Tables lists critical values of r for selected values of n and a.More generally, critical r values can be found by using the formula

where the t value is found from the table of critical t values (Table 3 in Appendix: Tables)
assuming a two-tailed case with n - 2 degrees of freedom. Use the formula for r given here and Table 3 in Appendix: Tables (with n - 2 degrees of freedom) to find the critical r values corresponding to H1: r ≠ 0, a = 0.02, and n = 27.

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t r =