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Math Help - Confidence Interval

  1. #1
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    Confidence Interval

    Hi guys...

    I cant understand what is CI and why we use it...sb plz explain it to me...
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  2. #2
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    Quote Originally Posted by memol View Post
    Hi guys...

    I cant understand what is CI and why we use it...sb plz explain it to me...
    Do you have a textbook or class notes. Refer to the, also Google. If there is anything specific you don't understand, please feel free to ask. Perhaps post a question and show what progress you've made on it and say where you get stuck.
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    Quote Originally Posted by memol View Post
    Hi guys...

    I cant understand what is CI and why we use it...sb plz explain it to me...
    As a high level deinition a confidence interval is a range around a statistical parameter of a sample where you expect a percentage of the sample to fall within.

    It is more complex then just this alone. It can be used to do many things, one of which is testing significance.
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  4. #4
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    thanX Mr fantastic, here is the part of my lec note that I couldnt understand:
    "The Gaussian distribution has the following interesting properties: approximately 68%
    of values fall within 1 standard deviation (SD) from ; 95% fall within 2 SD; and 99.7%
    fall within 3 SD."
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  5. #5
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    At this point my only comment would be, commit this to memory.
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  6. #6
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    Quote Originally Posted by memol View Post
    thanX Mr fantastic, here is the part of my lec note that I couldnt understand:
    "The Gaussian distribution has the following interesting properties: approximately 68%
    of values fall within 1 standard deviation (SD) from ; 95% fall within 2 SD; and 99.7%
    fall within 3 SD."
    68-95-99.7 rule - Wikipedia, the free encyclopedia

    68-95-99.7 Rule

    http://www.occc.edu/tmurphy/2013notesChapter14.pdf
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