Tables are presented giving the critical values of the Biserial and the Point Biserial correlation coefficients (when the null hypothesis assumes a value of zero for the coefficient) at the 0.05 and the 0.01 levels of significance.
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Ferguson, G. A.Statistical analysis in Psychology and Education (4th ed.). McGraw-Hill, 1976.
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Guilford, J. P. and Fruchter, B.Fundamental statistics in Psychology and Education. (6th ed.). McGraw-Hill, 1978.
