### A Development of Diagnostic Test in Mathematics Word Problems Solving for Prathomsuksa 6 Students under Suphanburi Primary Educational Service Area Office 1

#### Abstract

The objectives of this research were 1) to develop and validate the quality of the diagnostic test in Mathematics word problems solving for prathomsuksa 6 students under Suphanburi primary educational service area office 1 and 2) to create a diagnostic test manual. The 444 research samples were prathomsuksa 6 students under Suphanburi primary educational service area office 1 in second semester of the academic year 2014. They were selected by means of the Stratified sampling technique. The research steps were as follows: (1) Construct the table of specification of the diagnostic test. (2) Construct the short answer and show how explore tests to investigate the mathematics word problems solving defects according to diagnostic test specification then used to test the samples for collecting the word problems solving defects. (3) Construct the 4 –choice 2 diagnostic test; the first was numbers, fractions, decimals and application, and the second was equations and solving equations, quadrilateral, circular and three-dimensional geometry by using mathematics word problems solving defects as options. (4) Validate the diagnostic tests content validity by 5 specialists and modify the diagnostic tests. (5) Try out the diagnostic tests with samples three times; 1) to study the understanding of testing and obviousness of diagnostic tests, 2) to analyse difficulty level, discrimination index, and distracter efficacy, and 3) to create the mathematics diagnostic test manual, to analyse the diagnostic test reliability, and to validate the diagnose manual. The research results revealed that the 2 mathematics diagnostic test were the soundness tests that could be efficiently use to diagnostic tests the word problems solving defect. The first test composed of 60 items, the item difficulty level ranged from 0.65 to 0.87, the discrimination index ranged from 0.21 to 0.71, and the internal consistency reliability was 0.93. The second test composed of 60 items, the item difficulty level range from 0.65 to 0.86, the discrimination index ranged from 0.27 to 0.82, and the internal consistency reliability was 0.93. 2) This diagnostic test manual can be used to diagnose students' defiencies

#### Keywords

Diagnostic Test; Mathematics; Prathomsuksa 6 Students; Word Problems Solving

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