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A1 أحمد، زهرة شهاب A2 عراك، محمد مطر A2 سلومي، عماد داود AB Sensitivity measurements is regarded as one of the important condition that should be taken into consideration in measurement tools since it is sekometric feature not less important than the other Seiko metric features such as honesty and consistency. Honesty and consistency may have psychological measurement , but it may not be sensitive in the measurement of relation between the feature and performance .Thus, the main objective of the research is to identify The effect of sample size difference in sensitivity index of personality measurement of students of colleges of physical education in colleges of physical education in the universities of middle Euphrates / Iraq( Kufa, Kerbala, Babylon , Al-Qadissyia ,Al-muthana) , and to achieve this objective, the researchers compared between samples after dividing them into six sizes . The number of individuals of these sizes is as follows: (50, 100,150, 200, 250, 300), the samples withdrawn in every stage of the selection stage by Stratified random method. The researchers used the descriptive approach by survey. Measurement of Freiburg for personality represents the main tool of the study. After checking the validity of the measurement for application, the researchers started to apply the five sizes samples and responses analyzed. After counting sensitivity measurement index of bilateral variance data and by using Jackson equation, and in the light of a statistically significant of normal distribution, it has been clear that there is a difference in levels of the statistically significant between sample sizes. Therefore, the researchers concluded that once the sample size increases, measurement sensitivity appeared better.(Published abstract) http://search.shamaa.org/abstract_en.gif OP ص ص. 141-152 T1 تأثير اختلاف حجم العينة في مؤشر حساسية مقياس الشخصية لطلبة كليات التربية الرياضية [مقال] UL https://www.iasj.net/iasj/article/125738 النص الكامل (PDF) 1 http://search.shamaa.org/fulltext.gif