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Translation needed!

  1. Nov 22, 2003 #1
    I was wondering if someone could help me interpret a grade sheet I got in physics? Below is a slip that I received after our last quiz.
    I understand what the first three columns are, but the Percentile, Mean%, and SD is what is comfusing me. I really do not know where I stand, in this class, compared to the rest of my fellow students.

    I tried to copy this to a post, but I would not take. Below is the attatchment.
    barry

    Quiz Individual Performance GroupPerformance
    Max. Score Score(%) Percentile N Mean(%) SD
    Quiz 40 36.50 91.25% 42 6 85.63% 11.88
    Total 40 36.5 91.3% 42 6 85.6% 11.9
     
    Last edited: Nov 22, 2003
  2. jcsd
  3. Nov 22, 2003 #2

    Integral

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    Your precential means that you did better the 58% of the people taking the test, N could/should be the number taking the test (6? pretty small class!) SD is the standard deviation, 66% of the scores fall within 1 SD of the mean. For this test 66% of the scores fell between 96% and 84%
     
  4. Nov 22, 2003 #3
    Integral, thanks for the response. Is there a better way that I
    could have posted the bottom part of my request?
    I tried to attatch a DOC image, but it would'nt take.

    Is 66% a standard for SD? We have 26 students in this class
    (internet quizes), I was the first to take it. Also, how did
    you arrive at 58%?
    barry
     
  5. Nov 23, 2003 #4

    Integral

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    I read the numbers as

    Max. Score Score(%) Percentile N Mean(%) SD
    40 36.50 91.25% 42 6 85.63% 11.88
    Total 40 36.5 91.3% 42 6 85.6% 11.9

    ------------Quiz-----Total
    Max.------- -40------- 40
    Score-------36.5------36.5
    Score(%)----91.25%----91.3%
    Percentile --42--------42
    N-------------6---------6
    Mean(%)------85.635----85.6%
    SD-----------11.88------11.9

    looks like it should read
    ------------Quiz-----Total
    Max.------- -40------- 40
    Score-------36.5------36.5
    Score(%)----91.25%----91.3%
    Percentile --4---------4
    N------------26--------26
    Mean(%)------85.635----85.6%
    SD-----------11.88------11.9

    This changes the percentile allot, now you are in the 4th percentile which means you have a better score then 96% of the class


    Initially I assumed that the SD was a percent, In reality it may be in points, which seems pretty broad considering it was a 40 point quiz.

    1 standard Deviation is defined to be the span around the mean which contains 66% of the things being averaged. You may want to do a web search on the term it is a very commonly used statistic.
     
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