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... out off the correlation of the rest of my data it will affect my results. From this, I will extract 100 random people, 50 girls and 50 boys this is because we need an equal number so that we can compare them to each other. I will use 50 Girls and boys IQ and ks2 total scores because it is a big enough to represent the whole of the data but is not too big so that it would use up all of the time allocated. First I will have to collect the information that I need, that is each pupil's IQ, gender and ks2 results. I need these so I can put them in my diagrams and calculations. Then I will sort out this data so that there will be a proportionate sample of all the years and sexes, I will do this by doing a stratified sample this ...