The Power of the Statistical Tests and the size of Effect of the Educational Researches Published in Al Quds Open University Journal for Researches and Studies

Abstract

The current study aimed at identifying the power of the statistical tests in the educational researches published in Al-Quds Open University Journal for researches and studies. The study included all the educational researches that used the statistical (t) & (F) tests in all editions of Al-Quds Open University Journal for the period between (2002-2010) .The number of these studies was (74) and included (445) statistical tests, where (226) used the statistical (t) and (219) used the statistical (F). The necessary data was collected to calculate both the size of the effect and the power of the statistical test. The results pointed out that about (27%) of the hypotheses contained a small size and the average for (t) test was (0.38) while the average fot the (F) test was (0.12). The results indicated that around (71%) of the selected hypotheses had a poor statistical power test, around (6%) of the hypotheses had a medium statistical test power, and (23%) of the hypotheses had a high statistical power test.