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A question about Edexcel S1

Discussion in 'Mathematics' started by pwc9000, Jun 12, 2011.

  1. pwc9000

    pwc9000 New commenter

    I am more of specialist in Mechanics and Decision when it comes to A-Level Maths and have avoided Statistics as much as possible. However I have the need to get my head round S1. With reference to some prior knowledge, the specification and couple of textbooks I think I have got my head round most of it. I do have one question though:
    How important in learning S1 is the difference between a sample mean,variance,standard deviation and a population mean,variance,standard deviation?
     
  2. adamcreen

    adamcreen Occasional commenter

    completely irrelevant. the specifications do not care, and the markschemes allow both the n and the n-1 divisor.
     
  3. Maths_Mike

    Maths_Mike New commenter

    I agree with Adam
    In any case peple really get their knickers in atwist about this for no real reason.
    The vast majority (and I would be tempted to say all) data is actually a sample. So theorectically the vast majority of the time we should use the unbiased estimate (n-1), but with n large and by large we really mena about 50 or more the difference is neglible.
    So what thye need to know is that when sampling the bigger the sample the more acurate the results.
    PS this is not the same as knowing the difference between the distrbution of the population and the distribution of the sample means (i.e Central limit theorem) with is fundamentally imporatnt knowledge
     
  4. adamcreen

    adamcreen Occasional commenter

    Fundamentally important for the S3 module (in Edexcel) but probably not for your AS students!
     
  5. Maths_Mike

    Maths_Mike New commenter

    has that really gone to S3 now - OMG
     
  6. Colleen_Young

    Colleen_Young Occasional commenter

    MEI care.
    If you do MEI read the spec!
     
  7. pwc9000

    pwc9000 New commenter

    Thank you all - very helpful
     
  8. MEI published a paper on this a few years ago (but not relevant to Edexcel):
    http://www.mei.org.uk/files/statistics/SDNewsletterXtra.pdf
     

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