القيم الشاذ في أداء الطلبة على اختباري القدرات و التحصيل و أثر أسلوب التعامل معها في نتائج التحليلات الإحصائية

Abstract EN

The study aimed to determine the outlier values in the students' grades in the ability and achievement tests and the effect of the method of dealing with them in the results of the statistical analyzes.

To achieve the objectives of the study, a stratified random sample of (200) students was selected for each of the two tests.

With the outlier values on the results of t-test for the independent samples, one-way ANOVA and the simple linear regression analysis.

The t-test of two independent samples showed different results where the practical significance and the strength of the test were in the cases of deletion or replacement of the outlier values.

The results of the regression are different according to the method of dealing with the outlier values, The results showed that the achievement test was a good predictor of ability testing