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 Post subject: % mark of 11+ exam needed to score 230?Posted: Fri Oct 06, 2017 12:25 pm

Joined: Wed Mar 01, 2017 11:22 pm
Posts: 143
Hi all as the result day draws nearer, I am still confused with the raw score/ standardised score for the 11+ exam.

For example if DS who is June born, needs to achieve a safe score of about 230 in the Birmingham exam, what pass percentage of the exam will he have needed to pass?

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 Post subject: Re: % mark of 11+ exam needed to score 230?Posted: Fri Oct 06, 2017 12:38 pm

Joined: Mon Feb 12, 2007 2:21 pm
Posts: 16254
Nobody knows as it will vary according to the raw marks of the children sitting each year.

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 Post subject: Re: % mark of 11+ exam needed to score 230?Posted: Fri Oct 06, 2017 12:41 pm

Joined: Wed Mar 01, 2017 11:22 pm
Posts: 143
Thank you Guest55

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 Post subject: Re: % mark of 11+ exam needed to score 230?Posted: Fri Oct 06, 2017 12:55 pm

Joined: Sat Oct 01, 2016 6:02 pm
Posts: 1183
Standardisation works approximately like this (assuming they're using a standard deviation of 15):

All the raw scores are ranked from bottom to top. So for a test out of 70, the lowest mark might be 15 and the highest mark might be 69. The person who gets 15 is given a standardised score of 60. The person who gets 69 is given a standardised score of 140.

Then all the raw scores are averaged and it's found that the mean average score was 52. So everyone who scores 52 is given a standardised score of 100.

The rest of the raw scores are then distributed along the curve. The distribution will be such that two-thirds of the cohort will score between 85 and 115 and the other third is split so that one-sixth is between 60 and 84 and the other sixth is between 116 and 140.

Hopefully you can see that you can't work out the raw score from the standardised score. The raw score you need to pass can vary year on year, perhaps because a test one year might be unusually easy or difficult - it won't affect the standardised score because people will still be distributed along the same curve.

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 Post subject: Re: % mark of 11+ exam needed to score 230?Posted: Fri Oct 06, 2017 4:15 pm

Joined: Wed Mar 01, 2017 11:22 pm
Posts: 143
streathammum wrote:
Standardisation works approximately like this (assuming they're using a standard deviation of 15):

All the raw scores are ranked from bottom to top. So for a test out of 70, the lowest mark might be 15 and the highest mark might be 69. The person who gets 15 is given a standardised score of 60. The person who gets 69 is given a standardised score of 140.

Then all the raw scores are averaged and it's found that the mean average score was 52. So everyone who scores 52 is given a standardised score of 100.

The rest of the raw scores are then distributed along the curve. The distribution will be such that two-thirds of the cohort will score between 85 and 115 and the other third is split so that one-sixth is between 60 and 84 and the other sixth is between 116 and 140.

Hopefully you can see that you can't work out the raw score from the standardised score. The raw score you need to pass can vary year on year, perhaps because a test one year might be unusually easy or difficult - it won't affect the standardised score because people will still be distributed along the same curve.

Thank you so much streathammum!
Roll on next Friday

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