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My hypothesis is that people with siblings have a lower IQ than people without siblings. Also that people with lower IQ's have lower KS2 results.

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Data Handling Task

Matthew Moorhouse


My hypothesis is that people with siblings have a lower IQ than people without siblings.   Also that people with lower IQ’s have lower KS2 results.

IQ Levels

        Using all the pupils available for KS4, I made a scatter graph showing how many siblings a pupil has against their IQ.   I saw several points, which were extreme so I deleted these from my graphs.   At this point I looked for a line of best fit but the line was almost horizontal so it would have been of no use.   After this I made a bar graph so I could see how many pupils had a given IQ.   This showed a concentration of pupils around the 100 – 104 area.  

        I produced several bar graphs so I could easily see any relation between sibling numbers and IQ.    The sort of relation I was looking for was that pupils with no siblings had a higher IQ than those with lots of siblings.

The number of pupils in certain sibling groups from KS4 was in some cases very low (11 in one case).

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In fig 1 I found the average of the KS2 results for each sibling group,  however there is very little difference between the average score.   The only real difference is in the 6+ sibling group were the Science and English results are highest in the table,  but in Maths the 0 siblings are highest.   This table dispels my theory that pupils with, 0 siblings have better results than pupils with siblings.

        I then went on to make fig 2 (which uses the data from fig 1),  so I could see any sort of trend easier.   Although fig 2 didn’t quite achieve what I was looking for it did show a drop in marks towards the higher sibling count groups,  but a strange peak in the 6 and above sibling count group.   After examining fig 2 I averaged the 3 subject results again so I could better see the trend.  

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0; 3.888889











6 to 12




Fig 2. image00.png

Fig 3.


Fig 4


KS2 Conclusion

From these results my conclusion is that if you are an only child or have 6+ siblings you have a better chance of getting a high KS2 result.   If you have 1 to 5 siblings your results will get lower as your siblings increase.

Final Conclusion

        My original hypotheses do not stand up when confronted with this evidence.   An increase in the number of siblings does not result in a decrease in IQ,  but those with 5 siblings stand out as having a higher average IQ.

        A lower IQ does not result in lower KS2 results.   The pupils with the highest KS2 results have an average IQ and the pupils with the highest IQ have an average KS2 result (I found this by comparing Fig 3and Fig 4).

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