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    I need help with the two tailed tests! I'm so bad at theme don't undertanad IT at all can anyone help pls?
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    Does anyone have any good sources for revision on this exam?
    I'm retaking this exam from last year and I honestly cannot remember any of it. I fine that overall MEI OCR Maths doesn't have enough resources anyway, let alone anything that isn't Core _..
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    (Original post by DashDotDotDash)
    Does anyone have any good sources for revision on this exam?
    I'm retaking this exam from last year and I honestly cannot remember any of it. I fine that overall MEI OCR Maths doesn't have enough resources anyway, let alone anything that isn't Core _..
    I'm just doing a load of past papers
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    (Original post by corey7695)
    I'm just doing a load of past papers
    I think I might to the same, I like to make notes and then do it, (especially as I actually have no idea)
    But I just cant find any good materials to make notes from,
    So I'm just gonna do past papers with the book (-this is what happens if you retake and don't study in your own time kids)
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    (Original post by DashDotDotDash)
    Does anyone have any good sources for revision on this exam?
    I'm retaking this exam from last year and I honestly cannot remember any of it. I fine that overall MEI OCR Maths doesn't have enough resources anyway, let alone anything that isn't Core _..
    I find integral maths is a really good website for specific topic questions, if you dont have a login you could use mine as ive already let a few people use it already because its really useful, just message me.
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    http://vle.woodhouse.ac.uk/topicdocs.../S12014May.pdf

    2014 paper, it took me a while to find it so im sharing it here x
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    What are point probabilities?
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    yes i'm also doing this, im using the cgp guide nd past papers
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    (Original post by ¡Muy bien!)
    What are point probabilities?
    Do we even have to know about them never heard about them during this course
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    Do we need to know how to calculate the median from a grouped frequency table?
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    (Original post by anonymousADHD)
    Do we need to know how to calculate the median from a grouped frequency table?
    Yeah it's called linear interpolation :ahee:

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    (Original post by Azula)
    Yeah it's called linear interpolation :ahee:

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    Oh gosh what really? How are you suppose to do that?!
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    does anyone reckon histograms will come up? or hypotheses testing/critical regions?
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    (Original post by IGCSEKid)
    does anyone reckon histograms will come up? or hypotheses testing/critical regions?
    They come up like every year

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    (Original post by anonymousADHD)
    Oh gosh what really? How are you suppose to do that?!
    I hope that helps :awesome:


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    I struggled with two tailed just two days ago but I hacked it haha
    Okay so firstly, you need to know hypothesi testing for significance levels & critical region
    One tail involes (lets say prob is 0.5)
    Ho : p = 0.5
    H1 : p > 0.5 OR p < 0.5 (depending on ques, as you probs know)
    and then you either do sig level version:
    In the ques you get x value (say its x = 14)
    if p > 0.5 then P(X>/14)
    if p < 0.5 then P(X</14) that means less than equal to btw haha
    Now whichever it is, you compare to sig level (has to be below it)

    or do critical region version:
    if p > 0.5 then compare to high tail of critical region (trial & error)
    if p < 0.5 then compare to low tail of critical region (both have to be below it)

    For two tail testing, it involves:
    Ho : p = 0.5
    H1 : p DOESNT EQUAL 0.5
    and then you do same thing but for sig level version:
    -you HALF sig level
    e.g. so say x = 12 and its two tail and sig level is 5% (0.05)
    it'll be P(X</12) compared to 0.025

    for CR version:
    -you HALF sig level
    -you do for both p > 0.5 AND p < 0.5
    e.g. say sig level is 5% (0.05) and X~B(20, 0.5)
    -check on tables for biggest n value for where P(X</ something) is less than 0.025
    -check on tables for biggest n value for where P(X>/ something) is less than 0.025

    Hope that made sense, if not, send a question & I'll happily do a question for you explaining all
    Good luck
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    is it guaranteed there will be a hypothesis test?
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    How many decimal places/sig fig do you put your answers too? The rule seems different for every type of question (often losing me like 5 marks in past papers! :-/)


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    My dad works in the printing department for OCR, he told me there's no point revising two tailed tests...
 
 
 
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