Results 1 to 2 of 2

Thread: Standard Deviation question

  1. November 23rd 2009, 07:29 PM #1
    chewitard
    chewitard is offline
    Newbie
    Joined
    Oct 2009
    Posts
    14

    Standard Deviation question

    I know that the standard deviation of X is sqrt of the variance of X.

    How do I find the standard deviation of (aX + b) if X has a variance of σ^2?
    Follow Math Help Forum on Facebook and Google+
  2. November 23rd 2009, 10:34 PM #2
    matheagle
    matheagle is offline
    MHF Contributor matheagle's Avatar
    Joined
    Feb 2009
    Posts
    2,762
    Thanks
    2
    V(aX+b)=a^2V(X) do you want a proof?

    So, \sigma_{aX+b}=|a|\sigma_X

    since \sqrt{a^2}=|a|
    Follow Math Help Forum on Facebook and Google+
« [SOLVED] cinema problem | Need help with this problem: »

Similar Math Help Forum Discussions

  1. Standard Deviation Question
    Posted in the Advanced Statistics Forum
    Replies: 2
    Last Post: December 3rd 2011, 08:14 AM
  2. Help with mean and standard deviation question.
    Posted in the Statistics Forum
    Replies: 2
    Last Post: November 18th 2009, 10:53 PM
  3. Standard deviation and mean question
    Posted in the Statistics Forum
    Replies: 3
    Last Post: November 13th 2009, 11:18 AM
  4. Standard Deviation question?
    Posted in the Advanced Statistics Forum
    Replies: 1
    Last Post: October 8th 2007, 08:45 PM
  5. question about standard deviation
    Posted in the Math Topics Forum
    Replies: 1
    Last Post: October 7th 2005, 05:16 PM

Search Tags


/mathhelpforum @mathhelpforum