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- 1. PSLE T-Score Explained ? ? ?
- 2. OUTLINE <ul><li>PSLE is a placement exam </li></ul><ul><li>What is the PSLE Aggregate SCORE? </li></ul><ul><li>Why is T-Score used? </li></ul><ul><li>Definition & Calculation of T-Score </li></ul><ul><li>Questions about T-Score </li></ul>
- 3. PSLE - a placement exam <ul><li>Need to reflect the relative achievement level of pupils within their peers. </li></ul><ul><li>Places pupils into different courses according to their academic ability </li></ul><ul><li>Enables posting to secondary schools by merit and as far as possible into a school of their choice. </li></ul>
- 4. What is PSLE Aggregate Score? It is a sum of scores. What are these scores? Are they raw scores?
- 5. The PSLE Aggregate Score <ul><ul><li>incorporates performance of pupils in all 4 subjects </li></ul></ul><ul><ul><li>allows pupils to be ranked fairly </li></ul></ul>
- 6. Can raw scores be used? NO !
- 7. Why Not? <ul><ul><li>Different subjects have different levels of difficulty </li></ul></ul><ul><ul><li>So are the spread of marks from the average mark, i.e. the standard deviation (spread = standard deviation) </li></ul></ul>
- 8. MEASURE OF S P R E A D Narrow Wide
- 9. DOLLY I scored 85% in both English and Mother Tongue ! H U R R A Y !
- 10. Dolly scores 85% in both EL and MT EL EL ave = 60 MT MT ave = 80 0 100 85% <ul><li>Her performance in MT is very close to that of other pupils </li></ul><ul><li>She did much better in EL as compared to other pupils </li></ul>
- 11. A need for standardisation of the raw scores Transformed Score or T-Score
- 12. T-Score MT T-Score converts average mark of each subject to a common score of 50 points. It also converts other marks taking into consideration the extent to which they differ from the average and the size of spread of the marks around the average ave = 60 EL ave = 80 50 85% 85%
- 13. What is T-Score? <ul><ul><li>It gives the relative position of a pupil’s performance as compared to the performance of all the other pupils in that subject </li></ul></ul><ul><ul><li>The raw mark obtained in the exam only shows how good the pupil is in that subject, not how good he is as compared to others </li></ul></ul>
- 14. How is T-Score calculated for each subject? where X: pupil’s mark for the subject Y: average mark (mean) scored by all pupils Z: spread of marks around the average mark (standard deviation) Z Y ) - ( X 10 50 T
- 15. Example: <ul><li>Pupil’s mark (X) in exam = 50.0 </li></ul><ul><li>Average mark (Y) scored by all pupils = 68.0 </li></ul><ul><li>Spread of marks (Z) around the average mark (Y) = 14.0 </li></ul>T = 50 + 10 (50 - 68.0) 14.0 = 37.14
- 16. How is the Aggregate Score calculated? By adding the T-Scores of the 4 subjects
- 17. Example: Subject Total Mark T-Score EL1 200 105 34 CL2 200 152 51 Maths 100 67 53 Science 100 58 47 Aggregate: 185
- 18. Finally, all pupils are ranked according to their Aggregate Scores
- 19. T-SCORES & GRADES: Is it possible for a pupil with 3A* and 1A to be ranked lower than another pupil who has only 1A* and 3As? Yes, it is possible
- 20. Aggregate T-Score: 246 249

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