2010 PSLE Discussion

[ctct61t]

atutor2001:

Just simple arithmetics and simultaneous equation.



Top T-scorer is 282 --> 282/4 = 70.5 (average T-score per subject)

T-score = 50 + 10x(Raw score - Mean)/Std D = 70.5
10x(Raw score - Mean)/Std D = 70.5 - 50
10x(Raw score - Mean)/Std D = 20.5
(Raw score - Mean)/Std D = 2.05
(Raw score - Mean) = 2.05 x Std D
Mean = Raw score - 2.05 x Std D
(I have assumed that the average raw score for this great guy is 99)

Mean = 99 - 2.05 x Std D --- eqn 1

Someone posted that with 4A* the T-score is 263. (I assume that the average raw score is the minimum for A* = 91.)

Using the similar process, to obtained the 2nd equation :

T-scorer is 263 --> 282/4 = 65.75 (average T-score per subject)

T-score = 50 + 10x(Raw score - Mean)/Std D = 65.75
10x(Raw score - Mean)/Std D = 65.75 - 50
10x(Raw score - Mean)/Std D = 15.75
(Raw score - Mean)/Std D = 1.575
(Raw score - Mean) = 1.575 x Std D
Mean = Raw score - 1.575 x Std D

Mean = 91 - 1.575 x Std D --- eqn 2

Solving eqn 1 & 2,

Std Dev = 16.84 marks
Mean = 64.47

Just an indicative estimate but it gives me an idea of the mean and the spread.

Thank atutor2001, it's very clearly explained my question...do you know what the A*, A, B, C...score is?

[atutor2001]

ctct61t:

Thank atutor2001, it's very clearly explained my question...do you know what the A*, A, B, C...score is?

If there is no change, the scores should be :

A* > 91
A 75 - 90
B 60 - 74
C 50 - 59
D 35 - 49
E 20 - 34
U < 20

[ctct61t]

atutor2001:

ctct61t:

Thank atutor2001, it's very clearly explained my question...do you know what the A*, A, B, C...score is?

If there is no change, the scores should be :

A* > 91
A 75 - 90
B 60 - 74
C 50 - 59
D 35 - 49
E 20 - 34
U < 20

Thank atutor2010, you are so nice... :thankyou: :lovesite:

[corneyAmber]

The scores of A*, A etc…DOES NOT vary with T-scores.

[georgechen99]

Can anybody clarify with me Why the table G-1 on the booklet does not include all sch? There are only 66 schools on that list, but there are totally 160+ schools, I understand there are some IP schools should be excluded, but still meet that gap. Thanks.


I need to know the Band level for the target school.

[Sun_2010]

ksi:

The scores of A*, A etc....DOES NOT vary with T-scores.

Yes, but while the ranges mentioned by atutor are right, there could be some moderation done to the range ...

[meow26]

I don’t quite understand. If grades are not moderated, won’t everyone get a poor grade when the exams are tough and As when exams are easy?

[LOLMum]

i dont see scgs on the list :? .


any idea how the school fare in psle?

[mellette]

atutor2001:

ctct61t:

Thank atutor2001, it's very clearly explained my question...do you know what the A*, A, B, C...score is?

If there is no change, the scores should be :

A* > 91
A 75 - 90
B 60 - 74
C 50 - 59
D 35 - 49
E 20 - 34
U < 20

Hi, My son got A* for Maths, A for English and A for Science.. based on the worst case scenerio he should be getting 240, however he only returned a 230 by MOE. He is exempted from MT..

Need advise as to should I appeal ..becos the 10 pionts make a huge difference in school application.

Thanks all

[atutor2001]

mellette:

Hi, My son got A* for Maths, A for English and A for Science.. based on the worst case scenerio he should be getting 240, however he only returned a 230 by MOE. He is exempted from MT..

Need advise as to should I appeal ..becos the 10 pionts make a huge difference in school application.

Thanks all

I think the method for computation of aggregate T-score for students taking 3 subjects is different from those taking 4 subjects.

Based on A*, A & A, the \"worst-case\" total raw score is 241, giving an average of 80.3 marks per subject and an average of 59.42 T-score per subject.

With only 3 subjects, the total T-score will be only 59.42 x 3 = 178.26, which cannot be used to compare with other students whose aggregate T-score is based on the total of 4 subjects.

My guess is that since MT is exempted, MOE will award a T-score of 50 (which is the equivalent of getting the average mark) for MT. So the modified T-score for comparison with those with 4 subjects will be 178.26 + 50 = 228.26, which is quite near to your son's T-score (i.e. his raw-scores are better than the worst case scenario)

Hope my guess makes sense.