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Math Help - Z Scores

  1. #1
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    Z Scores

    This is my first time to this forum.....I wish I had found it earlier in my Stats class.

    My question is:
    Where would I go to find the z-score that corresponds to different percentile?
    For example the 35th or the 72nd or what not.

    I know that the mean is o and 1 standard deviation to either side is about 34%.

    Please help!!!



    The z-score that corresponds to the 72nd percentile?
    Last edited by stat student; July 22nd 2007 at 12:06 PM.
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  2. #2
    Eater of Worlds
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    Locate 0.72 in the Standard Normal table and find the corresponding z-score.

    Apears to be about z=0.583
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  3. #3
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    Quote Originally Posted by stat student View Post
    This is my first time to this forum.....I wish I had found it earlier in my Stats class.

    My question is:
    Where would I go to find the z-score that corresponds to different percentile?
    For example the 35th or the 72nd or what not.

    I know that the mean is o and 1 standard deviation to either side is about 34%.

    Please help!!!



    The z-score that corresponds to the 72nd percentile?
    You need a table of the cumulative standard normal distribution. This is a
    table that gives the p-value for a given z-score. To find a z-score
    corresponding to a given p-value you use the table in reverse.

    A table can be found at the bottom of this page.

    RonL
    Last edited by CaptainBlack; July 22nd 2007 at 12:44 PM.
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  4. #4
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    What is the p in this case? So you told me that 72% is 0.583....could you explain to me step by step how to find say the 35%

    thanks again to both of you
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  5. #5
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    Quote Originally Posted by stat student View Post
    What is the p in this case? So you told me that 72% is 0.583....could you explain to me step by step how to find say the 35%

    thanks again to both of you
    Well, I think p is percentile. But that's about all I know. I'm also having a ton of trouble understanding z tables!
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  6. #6
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    How do i read the table?

    I found .583 if I follow the column up I find .001 and all the way to the left I find .2..........I am really confused...I just don't get it....how do I read the table?
    Last edited by stat student; July 22nd 2007 at 01:15 PM.
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