A study of meta analysis of role of pre-school education and bilingualism in education achivement

This research using one of new research methods namely meta-analysis evaluates the results of studies surveying effective agents bilingualism and preschool education in education achievement. These studies have been accomplished in Iran. In this way 28 accomplished researches about effective agents bilingualism and preschool education in scholastic achievement were gathered and 10 reports of them were chosen for meta-analysis. These reports on base of research methodology parameters concluding questions, theories, statistic society, sampling, research method, statistic method validity and reliability of inventory were chosen for meta-analysis. Statistic analysis by use of comprehensive meta-analysis software was done. This study using incorporation of effect size by Schmitt and Hunts method shown that there is no relation between bilingualism and education achievement, but there is relation between education achievement and preschool education.