COMPARATIVE ANALYSIS OF 5-POINT AND 6-POINT LIKERT SCALES IN PSYCHOLOGICAL TEST QUALITY

Problem statement: The purposes of this research were (1) to study the quality evaluation psychology test Likert’s scale 5 and 6 points (attitude test, locus of control test and achievement motive test) focusing on construct validity, discrimination and reliability, (2) to compare the study of quality psychology test between Likert’s scale 5 and 6 points and (3) to compare the study for personal decision making level between Likert’s scale 5 and 6 points. Approach: The subjects were 180 (60 for each test) undergraduate students from Mahasarakham University who were selected by purposive sampling. Results: The research tools were attitude test, locus of control test and achievement motive test comprised of measurement patterns developed for different variables. Means, standard deviation, Factors Analysis, Alpha Coefficient and t-test were used for data analysis. Conclusion/Recommendations: The research revealed that (1) higher component and Initial Eigenvalues cumulative percent of psychology test Likert’s scale 5 and 6 points, but psychology test Likert’s scale 6 points had more higher trend of discrimination and reliability than Likert’s scale 5 points, (2) construct validity, discrimination and reliability among Likert’s scale 5 and 6 points were compared. It was found different reliability at 0.05 level on achievement motive test only and (3) personal decision making level psychology test among Likert’s scale 5 and 6 points was different at 0.05 level.