Defect Diagnosis in Mathematics on Sequence and Series for Matthayom Sueksa Five Students in Schools in the Nonthaburi Three Consortium Under the Secondary Educational Service Area Office Nonthaburi

Abstract

In this thesis, the researcher diagnoses the mathematical deficiencies on sequence and series in the aspects of the use of theories, rules, formulas, and definitions; the operations; and the interpretation from questions of Matthayom Sueksa Five students in schools in the Nonthaburi Three Consortium under the Secondary Educational Service Area Office Nonthaburi in the academic year 2024. The sample population was obtained using the technique of proportional sampling (rule of three). The students from each school were the random units to obtain the sample population of 327 students from the total of 2,110 students. The research instrument was a four-option multiple choice diagnostic test in mathematics for Matthayom Sueksa Five students on sequence and series. The quality test of the diagnostic test in a parallel form of twenty pairs of questions, a total of forty items, found that every pair of the parallel questions exhibited the distribution of the answers in consonance with the difficulty index and the discrimination index at a comparable level. The reliability of the whole test of forty items was 0.940. In this research investigation, the researcher employed a computer program for the calculation of the basic statistics of percentage. Findings are as follows: 1) The aspect of the use of theories, rules, formulas, and definitions found that the students under study exhibited defects in not understanding theories, rules, formulas, and definitions at the highest level, 67.60 percent of the members. 2) The aspect of the operations found that the students under investigation exhibited defects in the lack of understanding regarding the calculations and the mathematical operations at the highest level, 65.70 percent of the members. 3) The aspect of interpretation from the questions found that the students under study exhibited defects in translating the meaning of the written language into series at the highest level, 70.30 percent of the members.