Normalization of Thorp's Reasoning Inventory (TRI) among University Students

Document Type : Research Paper

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Abstract

Many researchers believe that reasoning is one of the important aspects of science, which is helpful in scientific evaluation and understanding. Accordingly the purpose of this study was to prepare norm scores and determine the validity and reliability of Thorp's Reasoning Inventory (TRI) in B.A. University students. The sample was 300 students of Guilan Payame Noor University who were selected by random cluster sampling and completed TRI. Results showed that test reliability was .73 by Kuder-Richardson method, .88 by test-retest reliability, and .63 by split-half method. Correlation coefficient between TRI and Wason selection task was .61. Results of factor analysis revealed that the inventory had five factors, which could explain 56.16 percent of total variance. Also, results of rotated component matrix suggested that 26 questions should be removed out of 100 questions. Finally, research emphasize that Thorp's Reasoning Inventory is a reliable and suitable instrument for the measurement of reasoning among Iranians.

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