MAGNITUDE OF EXPERIMENTAL EFFECT AND A TABLE FOR ITS RAPID ESTIMATION

Sample size and probability values must be involved in the interpretation of experimental data. A correlation between group membership and the dependent variable explicitly describes the effectiveness of the independent variable. A table is provided which gives values of this measure directly from the sample size and t, z, F, or X2 values. Equivalents of this measure are provided both in terms of the difference between means and a measure of misclassification. The table is suitable as a power table and for dealing with several problems of experimental procedure and tactics. Decisions concerning acceptance of null or alternative hypotheses may be aided by the use of this measure. (PsycINFO Database Record (c) 2006 APA, all rights reserved). © 1968 American Psychological Association.