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    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?
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    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)
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    (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?
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    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
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    No you wouldnt!
    A 3 mark question allows 3.5 minutes to be answered.
    Also good scientific calculators only cost about £8 at most.
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    (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.
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    (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.
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    (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.
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    Have you got a casio fx-85GT? If so, there is a quick way to calculate r
 
 
 
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