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    Hi all,

    For OCR S1 (not MEI), can we use a calculator to work out r and just write the answer down and still get all the marks(if it doesn't specifically say 'show your working')?

    Thanks
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    For AQA i did the whole paper on my calc and got 88%. So i presume you can. If it says, whats r then if you give r you'll get full marks, however a small error will mean you get 0 and not half.
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    Why don't you just write down the sum you type into the calculator?
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    I am told that you can do this on OCR.
    We do MEI and our teacher said that on "every other specification" you can just write down the answer.
    But this might have been an exaggeration.

    If I were you, I'd write down the values of all of:
    S_{xx}, S_{xy}, S_{yy}, r
    And give the formula for r in terms of the other three as well.
    But that's just me - it might be over-kill, but in any case it will probably be useful when checking your answer
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    @ Brightgirl - The calculator can solve it without doing any sums, just type the data points in and it does it all for me ( I'm not lazy - I'm efficient - honest lol..)

    Placenta and Ste I think I probably will write down the workings/do it manually just to be on the safe side, then use the calculator as a double check. It would be so annoying to press a wrong button, get the wrong value of R and lose all the points.

    Thanks all.
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    (Original post by ste0731)
    For AQA i did the whole paper on my calc and got 88%. So i presume you can. If it says, whats r then if you give r you'll get full marks, however a small error will mean you get 0 and not half.
    That's true - it's all about the working out marks innit :teeth:
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    (Original post by rather game than revise)
    @ Brightgirl - The calculator can solve it without doing any sums, just type the data points in and it does it all for me ( I'm not lazy - I'm efficient - honest lol..)

    Placenta and Ste I think I probably will write down the workings/do it manually just to be on the safe side, then use the calculator as a double check. It would be so annoying to press a wrong button, get the wrong value of R and lose all the points.

    Thanks all.
    I think that's sensible.
    Thing is that it will take ages to write all that stuff out!
    Well it does for me anyway, because I write down a figure and then check it, for like every single number I write down.
    But maybe that's just me being over-overcautious :woo:

    I like being called placenta too
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    I seem to remember just using my calculator, that was with WJEC and about 4 years ago.
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    I to this day, doing stats at uni still don't know how to calculate or what the hell Sxx manually. Only seen the notation, but it looks long and boring xD

    Probably why I am going to fail stats tomorrow though.
 
 
 
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