الملخص الإنجليزي
This study aimed to verify psychometric properties of the test of mathematical abilities TOMA-2 in term of its validity and reliability, also the study aimed to found out its performance norms. The study sample consisted of 1028 students from all states of the Governorate of South Batinah. And the application of the test was during the second semester of the academic year 2010/2011.
The validity has been verified using five methods which are face validity, discriminatory validity, concurrent validity, predictive validity, and items validity. The results reveal that the test has a discriminatory ability among different ages (age 13, 14, 15 & 16) for the older ages.. The study found positive and significant correlation coefficients between Computation subtest and Numerical ability test and between: subtest Attitude towards mathematics and measure of Attitude towards mathematics. Also The results showed that the TOMA-2 and its five subtests were good predictors of Achievement in mathematics since there were significant correlation coefficients (at a = 0.01) ranged from 0.33 to 0.59 between the subtests and Achievement in mathematics, and 0.65 between the total score of TOMA-2 and Achievement in mathematics. The results indicate that each item of the test correlated significantly ( at a= 0.01) to its subtest; which shows the internal consistency of the test so it is a good indicator of validity
The reliability has been verified by two methods; internal consistency (n= 1028) & test- retest method (n=61). The result showed that the test's scores reliability was acceptable; Cronbach's alpha for the total score was 0.94. Also the stability coefficient between the two applications was 0.95 for total score and it was between 0.52 to 0.92 for subtests.
After establishing acceptable indications for TOMA-2's validity and reliability, the performance norms were derived using standard scores and percentiles. The norms were derived separately for males and females since there were significant differences in their performance in the TOMA-2.
