```Date: Fri, 30 Jun 2000 12:46:04 -0400 Reply-To: Jay Weedon Sender: "SAS(r) Discussion" From: Jay Weedon Organization: http://extra.newsguy.com Subject: Re: question on variance Content-Type: text/plain; charset=us-ascii Well if X is normally distributed, then ((X-mean)/SD)^2 is chi-square-distributed with one degree of freedom. FWIW, Jay. On 30 Jun 00 02:03:57 GMT, patrickm@MAIL.NEWCASTLE.EDU.AU (Patrick McElduff) wrote: >I thank those people who have responded to the question on the variance of x^. > >I don't believe that it is useful to use a taylor series expansion. A >taylor series is intended to approximate a complex function with a polynomial. > >The taylor series expansion of x^2 is only useful if you go to the second >order term; in which case the taylor series expansion of x^2 is x^2 - and >so it is for any other polynomial (terms above the second order term equal >zero because higher order derivatives equal zero). > >However I still don't know the answer to the problem but I am more than >happy to assume that x is a normally distributed random variable. > >Any other help will be appreciated. > >Regards Patrick ```

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