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i am doing my GCSE maths coursework, about handling data. one of my hypothesis' is:

"i think that people who are good at estimating the size of angles will also be good at estimating the length of lines"

SO, i have collected my data. my teacher said that because the two estimates are of different actual numbers, i need to work out the percentage difference between the estimate and the actual measurement.

i am trying to work out spearmans for the two data sets, so i worked it out, and i got 0.17. i then drew a scatter graph, and bingo, no correlation. i then remembered that i had left out the 1- part of the spearmans formula, so i re did the calculation, and got 0.83.

but there is still no correlation on the graph, as it hasnt changed, so basically it says no correlation, and spearmans says there is.

i am very confused. please help, it is due in TOMORROW!!!

thanks in advance.

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# GCSE maths coursework

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