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Math Help - Standard Deviation...

  1. #1
    Newbie
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    Standard Deviation...

    Hi All,

    Im really stressed =[

    I have started my Business IT degree at Uni and I have a module on 'Statistics and Data Analysis' for the first Semester.

    I just have to get past this exam and then I dont have to worry about it again!

    The problem is though, although I did really well on my GCSEs I done very badly in Maths. My ALevels did not consist of anymaths at all so its been a while!

    I'm struggling so much with Standard Deviation.

    The teacher has given me the typical equation, but he has (n-1) underneith the equation.

    When I look online I cant find why he has this.

    It just has n on the normal standard deviation equation.

    Can someone tell me if n always equals to 10? or does it equalto the number of values you have?? As all of the practice questions state n as 10.

    I have explained to my lecturer that i need extra support but our class is too big so he has no tmie to fully explain things to me..

    Can anyone help? x
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by leaaa View Post
    Hi All,

    Im really stressed =[

    I have started my Business IT degree at Uni and I have a module on 'Statistics and Data Analysis' for the first Semester.

    I just have to get past this exam and then I dont have to worry about it again!

    The problem is though, although I did really well on my GCSEs I done very badly in Maths. My ALevels did not consist of anymaths at all so its been a while!

    I'm struggling so much with Standard Deviation.

    The teacher has given me the typical equation, but he has (n-1) underneith the equation.

    When I look online I cant find why he has this.

    It just has n on the normal standard deviation equation.

    Can someone tell me if n always equals to 10? or does it equalto the number of values you have?? As all of the practice questions state n as 10.

    I have explained to my lecturer that i need extra support but our class is too big so he has no tmie to fully explain things to me..

    Can anyone help? x
    n is usually the sample size for normal distribution questions.

    RonL
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