Confidence Intervals and Significance Tests for Correlation and Regression
(1 of 5)
The formula for a confidence interval for Pearson's r is
The significance test for
Pearson's r is computed as follows:
with N - 2 degrees of
, r is Pearson's correlation and
is the number of pairs of
scores that went into the computation of r.
For example, consider the data shown below: .
With r = .8614 and N = 6,
with 6 - 2 = 4 degrees of freedom. From a t table
it can be found that the two-tailed
is p = 0.0275.