ESS210B
Prof. Jin-Yi Yu
An Example
qSuppose N = 21 and r = 0.8.  Find the 95% confidence limits on r.
qAnswer:
(1) Use Fisher’s Z transformation:
(2)
(2)
(2) Find the 95% significance limits
q
q
q(3) Convert Z back to r
q
q
q(4) The 95% significance limits are: 0.56 < r < 0.92
a handy way to
convert Z back to r