

Subject:
statistics question
Category: Science > Math Asked by: dvdempirega List Price: $5.00 
Posted:
06 May 2004 00:23 PDT
Expires: 05 Jun 2004 00:23 PDT Question ID: 341927 
what does it mean when there is a horizontal line over a variable in a statistical equation? see link: http://office.microsoft.com/assistance/hfws.aspx?AssetID=HP052090961033&CTT=98. 

Subject:
Re: statistics question
Answered By: tillga on 06 May 2004 01:08 PDT 
The horizontal line above a variable is (in a statistical context) used to indicate the average value of the variable. "Now that we have this nice notation, let's use it to come up with expressions for the sample mean, which we'll write as the letter 'x' with a bar over it, and the standard deviation, s. The mean is easy. It's the sum of the observations (which we've already done) divided by the sample size" from: ( http://www.tufts.edu/~gdallal/summary.htm ) _ X = SUM(Xi) / n with Xi = single values of X n = amount of values for X Iīve simplified the formual given in the above reference as we canīt use graphics here. I hope this helps to solve your problem. tillga Search strategy: ( ://www.google.de/search?sourceid=navclient&hl=de&ie=UTF8&oe=UTF8&q=average+statistics+notation ) 

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