Testing the Significance of Pearson's r
webstat.une.edu.au › test_signif_pearsonSo a correlation of -.65 is not an unusual score if the samples are only small. However, correlations of this size are quite rare when we use samples of size 20 or more. The following table gives the significance levels for Pearson's correlation using different sample sizes. Pearson's table. Table D. Critical values for Pearson r