Abstract:
The purpose of this research was to study the effects of scoring methods including 1) Raw Scoring method, 2) Confidence Weight Medhod, 3) Opitmal Scoring Weight by Parameter of Item Method and 4) Optimal Scoring Weight be Ability of Examinee ((Ɵ)) Parameter Method, on test scores, reliability andvadility coefficients. The subjects of this research were 1,011 Mathayom Suksa I students in Buriram Province in 1989 academic year. The multi-stage sampling was employed. The researcher-constructed science test was used to collect data. Data obtained were analyzed through use of Pearson Product Moment Correlation coefficient. Cronbach's Alpha Coefficient was used to determine the coefficient of test reliability. Spearman Rank Correlation coefficient was performed to find the correlation between students' ability ranked by teachers and that ranked by test scroes. The major findings of the research were : 1) correlation coefficients of the four scoring methods ranged from .941 to .983; 2) reliability coefficients of the tests determined by the Raw scoring method, the Confidence Weight Method, the Optimal Scroing Weight by Parameter of Item Method and the Optimal Scroing Weight by Ability of Examinee (Ɵ) Parameter Method were .705, .718, .886, .894, respectively ; and 3) on the average, validity coefficients of the test determined by the Confidence Weight Method, the Optimal scoring Weight by Parameter of Item Method and the Optimal Scoring Weight by Ability of Examinee (Ɵ) Parameter Method were higher than that determined by the Raw scoring method.