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Math Help - coding method to find sd and mean

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    coding method to find sd and mean

    coding method to find sd and mean-img_20140626_015922-1-.jpgClick image for larger version. 

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ID:	31183coding method to find sd and mean-img_20140626_020418-1-.jpg


    i am going to use coding method to do this question. a= assumed mean a=46.5 , i am not sure about b . what numer should i use for b ? why ? u=(x-a)/b
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    Re: coding method to find sd and mean

    Anyone cam reply?
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    Re: coding method to find sd and mean

    If your text book says "using the transformation u_i= \frac{x_i- a}{b}" then your text book will have to say what "a" and "b" mean- otherwise that is meaningless. I suspect that at least a clue follows the last item you give: it says the standard deviation of x is b times the standard deviation of u. What does your text book say about the standard deviation of u that makes that a useful transformation?
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    Re: coding method to find sd and mean

    Quote Originally Posted by HallsofIvy View Post
    If your text book says "using the transformation u_i= \frac{x_i- a}{b}" then your text book will have to say what "a" and "b" mean- otherwise that is meaningless. I suspect that at least a clue follows the last item you give: it says the standard deviation of x is b times the standard deviation of u. What does your text book say about the standard deviation of u that makes that a useful transformation?
    sorry. a=assumed mean which is alraedy given in the question ( a=46.5) , b=scaling factor (usually class width) ...
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