Prelim T-score Calculator

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Postby turquoise » Mon Oct 05, 2009 4:01 pm

Thanks mathsparks. Unfortunately, my dd's school does not provide us with the average and std dev so we can't calculate the aggregate even with the excel sheet.

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Postby Merlion » Mon Oct 05, 2009 5:55 pm

Basically, T-score for each subject = 50 + 10 * (X - Y) / Z
X: Student's score
Y: Average score
Z: Standard deviation

Just sum up the 4 subjects' T-score for the TOTAL T-score.

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Postby mathsparks » Mon Oct 05, 2009 10:21 pm

You're welcome, turquoise.

Hi Merlion, thanks for the formula.

Good luck and all the best to P6 kids in their psle.
Last edited by mathsparks on Tue Oct 13, 2009 9:21 pm, edited 1 time in total.

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Postby lwm99 » Tue Oct 06, 2009 12:31 am

mathsparks, you still did not say where to find the average and std deviation as many schools do not publish such information.

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Postby Merlion » Tue Oct 06, 2009 10:44 am

lwm99, different schools have different average and sd. If your kid's school does not provide that, then it is not possible to calculate the T-score. You can not use other school's average / sd and apply to your kid's score.
As tomorrow is PSLE already, it will be better to just concentrate on the real exam. Don't worry too much about the school prelim T-score which means nothing. Cheers. :celebrate:

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Postby mathsparks » Tue Oct 06, 2009 1:47 pm

lym99,
I mentioned at the beginning that you can only use the calculator if the school provides you the avg and std dev of the P6 prelim co-hort. Else it's quite pointless. You can call the school to ask. Some schools do provide the figures.

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Postby janice_koh » Tue Oct 06, 2009 1:58 pm

I agree with Merlion; just do your best in the paper :politebleah: I will tell my child.

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Postby janice_koh » Tue Oct 06, 2009 2:01 pm

Hi Merlion/Mathsparks,

My child has a average score of 65; do you think he will end up in the Normal stream?

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Postby mathsparks » Tue Oct 06, 2009 7:35 pm

Hi janice_koh,
Sorry I'm not pri school educator. Can't comment on that. But to have a better idea, you actually need to compare him amongst his cohort..that's where averages and std deviations come in. If the school has set an exceptionally tough paper to "wake" the kids up, then it's quite normal to have a low average.

Don't worry too much. All kids develop at different pace; some will blossom in secondary school and there're lots of normal stream students who do well.

Take care and all the best to your child.

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Postby lwm99 » Wed Oct 07, 2009 11:13 am

The way T-score calculated is if you are below the average score, you have less than 50 for that subject. So if assuming that the school prelim is a good reflection of national performance (which is not the case most of the time), then from the average scores you can roughly tell whether the kid has a T-score of more or less than 200, the cutoff point for express/normal streams, even though you do not know the standard deviations.

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