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Expression for the variances

  1. Sep 10, 2011 #1
    1. The problem statement, all variables and given/known data

    Determine the expression for the variances in x (that is [itex]\sigma[/itex]2) with respect to the appropriate variables for the following:

    a) X = [itex]\frac{wy}{z}[/itex], with variance in w,y,z

    2. Relevant equations

    I'm having trouble typing out the equation, but the equation I know for variance is here:
    http://people.richland.edu/james/ictcm/2001/descriptive/helpvariance.html

    Maybe I'm not thinking about this the right way, should I not be thinking about sample/population variance? So then I just tried thinking about what I'm trying to find.... Maybe I should be thinking about relating it to standard deviation to find it?
     
  2. jcsd
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