calculate the r for a critical value of z = 2.58 (alpha = .01) or z = 1.96 (alpha = .05)

z = r x sqrt(167 -1), sqrt (167-1) = 12.8841

r = 2.58/ 12.8841 = 0.20 for aplha = .01

r = 1.96/12.8841 = 0.15 for alpha = .05

Good point Jos

Or just see this link: https://www.bing.com/search?FORM=U528DF&PC=U528&q=Critical+values+for+Spearman+coefficient Best, D. Booth

r = [exp(2z) - 1] / [exp(2z) +1]

https://en.wikipedia.org/wiki/Fisher_transformation

Z TABLE:

http://www.z-table.com/