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April 8th, 2013, 02:50 PM  #1  
Newbie Joined: Jan 2012 From: Montreal, Canada Posts: 27 Thanks: 0  none in +/ 2 standard deviations
I have for sample: Quote:
I think ? would be smaller so there is something in that range (+/2?). Or perhaps there's some concept I don't understand which would make it possible for the whole sample to be limited in 1?.  
April 9th, 2013, 12:01 PM  #2 
Global Moderator Joined: May 2007 Posts: 6,704 Thanks: 670  Re: none in +/ 2 standard deviations
2? is the bound for approximately 95% of a sample. Since your sample size is 14, it is not surprising that they are all inside this range.

April 9th, 2013, 02:39 PM  #3 
Newbie Joined: Jan 2012 From: Montreal, Canada Posts: 27 Thanks: 0  Re: none in +/ 2 standard deviations
Thanks. At least I know it's not erroneous but it's weird for me to understand. Well I guess it's hard to have 1/20 in the range when there's not even 20 items. I didn't think about it that way.

April 9th, 2013, 02:43 PM  #4  
Newbie Joined: Jan 2012 From: Montreal, Canada Posts: 27 Thanks: 0  Re: none in +/ 2 standard deviations
Darn! I can't edit my last post. Well this is its PS. Quote:
Anyway I'm not concerned about the issue anymore.  

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