A Cross-Validation Readability Study of General Psychology Textbook Material and the Dale-Chall Readability Formula
Wayne D. Lee, Bernard R. Belden · The Journal of Educational Research · 1966
THE PURPOSE of this study is to ascertain how valid the Dale-Chall Readability Formula is when used to measure general psychology text book materials at Oklahoma State University. The question asked was : How valid are the pre dicted grade-level placements of passages taken from the textbook used in general psychology at Oklahoma State University when grade-level placements are correlated with an independent criterion of tested comprehension? Stated as a null hypothesis: No significant difference exists between the coefficient of correlation obtained in the original cross-validation of the Dale-Chall Readability Formula and the coefficient of corre lation obtained by correlating the readability index of a comprehension test with reading-grade level of certain students enrolled in general psy chology at Oklahoma State University who were able to answer three questions out of four on the test of comprehension.