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# S1 correlation Watch

1. Is there a faster way of working out r without a fancy calculator, at the moment I will die before I reach question 5 using the formula?
2. What board is this from? Most boards give you Sxy, Sxx and Syy. But this question is worth 3 marks so maybe 2 for Sxx, Syy and Sxy and the final mark for r = Sxy/sqrt(Sxx*Syy)
3. (Original post by TheGreatPumpkin)
Is there a faster way of working out r without a fancy calculator, at the moment I will die before I reach question 5 using the formula?
Purchase a calc

The cheapest one that could solve this is 15 pounds in whsmith

By the time you've finished calculating r manually I'd have finished the paper
4. No you wouldnt!
A 3 mark question allows 3.5 minutes to be answered.
Also good scientific calculators only cost about £8 at most.
5. (Original post by MathsSir)
What board is this from? Most boards give you Sxy, Sxx and Syy. But this question is worth 3 marks so maybe 2 for Sxx, Syy and Sxy and the final mark for r = Sxy/sqrt(Sxx*Syy)
AQA S1 2009 june, I have worked it out but it took about 10 minutes and that is not a good amount of time to spend on a three mark question.
6. (Original post by TheGreatPumpkin)
AQA S1 2009 june, I have worked it out but it took about 10 minutes and that is not a good amount of time to spend on a three mark question.
AQA C2 front cover
Show all necessary working; otherwise marks for method may be lost.
The decision is obviously yours.
7. (Original post by MathsSir)
AQA C2 front cover
Show all necessary working; otherwise marks for method may be lost.
The decision is obviously yours.
I'm sorry what do mean? Naturally I will show workings out, but I don't see how it relate to the question.
8. Have you got a casio fx-85GT? If so, there is a quick way to calculate r

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