Hi All,
Base on the feedback from all parents and using the result from 2007. 2007 PSLE is pretty similar to 2009; very difficult math, easy Chinese and some tricky Science questions.
I have estimated the parameter to calculate the T score as followed;
CL: Mean = 78, StdDev = 10
EL: Mean = 73, StdDev = 11
Math : Mean = 63, StdDev = 9
Sci : Mean = 67, StdDev = 12
Use the formula : 50  10 * (your score  Mean)/StdDev
for each subject. Sum them up, you should get a glimps.
All About TScore
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CrazyDad  GreenBelt
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by atutor2001 » Tue Oct 13, 2009 8:35 am
Hi Crazydad, you are great. Thanks. Is it a typo error? 5010*... or 50+10*..

atutor2001  KiasuGrandMaster
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CrazyDad  GreenBelt
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by atutor2001 » Tue Oct 13, 2009 8:59 am
Oh my ...!
Those who score 100 for math will get a Tscore of 91.
Those who score 100 for science (near impossible) will only get a Tscore of 77.5
100 in English (another impossible case) the Tscore will be 74.5
100 in Chinese (for PRC) the Tscore will be 72.
I hope you will now understand why I have made so much noise regarding the Math paper. There will be at least 50 pupils out there who get 100 for math, enjoying a disproportionate jump in their Tscore.
Anyway, MOE will sure have to moderate the marks. Otherwise the top student will have an aggregate Tscore of over 300 (a new record)
Those who score 100 for math will get a Tscore of 91.
Those who score 100 for science (near impossible) will only get a Tscore of 77.5
100 in English (another impossible case) the Tscore will be 74.5
100 in Chinese (for PRC) the Tscore will be 72.
I hope you will now understand why I have made so much noise regarding the Math paper. There will be at least 50 pupils out there who get 100 for math, enjoying a disproportionate jump in their Tscore.
Anyway, MOE will sure have to moderate the marks. Otherwise the top student will have an aggregate Tscore of over 300 (a new record)

atutor2001  KiasuGrandMaster
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by tutormum » Tue Oct 13, 2009 10:03 am
Using the formula together with highest possible scores and lowest possible scores, I've got unrealistic results. Can you please help me as I'm dumb in this. PLEASE, PLEASE, CrazyDad
What will my son's score be if he gets:
Maths 88
Science 80
Chinese 80
English 80
What will my son's score be if he gets:
Maths 88
Science 80
Chinese 80
English 80

tutormum  KiasuGrandMaster
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by Dharma » Tue Oct 13, 2009 10:09 am
atutor2001 wrote:Oh my ...!
Those who score 100 for math will get a Tscore of 91.
Those who score 100 for science (near impossible) will only get a Tscore of 77.5
100 in English (another impossible case) the Tscore will be 74.5
100 in Chinese (for PRC) the Tscore will be 72.
I hope you will now understand why I have made so much noise regarding the Math paper. There will be at least 50 pupils out there who get 100 for math, enjoying a disproportionate jump in their Tscore.
Anyway, MOE will sure have to moderate the marks. Otherwise the top student will have an aggregate Tscore of over 300 (a new record)
Hi atutor2001,
Thought max possible Tscore is 75.

Dharma  BlackBelt
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by atutor2001 » Tue Oct 13, 2009 10:13 am
tutormum wrote:Using the formula together with highest possible scores and lowest possible scores, I've got unrealistic results. Can you please help me as I'm dumb in this. PLEASE, PLEASE, CrazyDad
What will my son's score be if he gets:
Maths 88
Science 80
Chinese 80
English 80
The estimated Tscore will be:
CL  52.0
EL  56.4
M  77.8
Sc  60.8
Total : 247

atutor2001  KiasuGrandMaster
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Re: Estimate T Score for 2009 PSLE
by finder » Tue Oct 13, 2009 10:19 am
CrazyDad wrote:Hi All,
.......
I have estimated the parameter to calculate the T score as followed;
CL: Mean = 78, StdDev = 10
EL: Mean = 73, StdDev = 11
Math : Mean = 63, StdDev = 9
Sci : Mean = 67, StdDev = 12
CL 78, quite disadvantage for those strong at it.

finder  OrangeBelt
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by atutor2001 » Tue Oct 13, 2009 10:24 am
Dharma wrote:
Hi atutor2001,
Thought max possible Tscore is 75.
Unless MOE have set a maximum cutoff at 75, which I have not come across.
Otherwise, using the statistic formula, if out of 5000 studetns, everyone gets 0 and Tom is the only boy with 100, the Tscore of Tom will be 50050 because the standard deviation is very very small  0.02
Last edited by atutor2001 on Tue Oct 13, 2009 11:01 am, edited 1 time in total.

atutor2001  KiasuGrandMaster
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Re: Estimate T Score for 2009 PSLE
by Dharma » Tue Oct 13, 2009 10:36 am
CrazyDad wrote:Hi All,
Base on the feedback from all parents and using the result from 2007. 2007 PSLE is pretty similar to 2009; very difficult math, easy Chinese and some tricky Science questions.
I have estimated the parameter to calculate the T score as followed;
CL: Mean = 78, StdDev = 10
EL: Mean = 73, StdDev = 11
Math : Mean = 63, StdDev = 9
Sci : Mean = 67, StdDev = 12
Use the formula : 50  10 * (your score  Mean)/StdDev
for each subject. Sum them up, you should get a glimps.
Hi crazydad,
Seems like your SDs are bit low for the difficult papers. Because w/ your estimated figures, a child who scores an average of 96 for all 4 subjects will get an aggregate score of 302 > 300.
Last edited by Dharma on Tue Oct 13, 2009 10:43 am, edited 1 time in total.

Dharma  BlackBelt
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