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May 23rd, 2013, 06:25 PM  #1 
Newbie Joined: May 2013 Posts: 3 Thanks: 0  Measures of dispersion: SD
Does this question make sense? What percentages of subjects are included in 1 SD, 2 SDs, or 3 SDs from the mean? That is all it says. 
May 24th, 2013, 12:42 PM  #2 
Global Moderator Joined: May 2007 Posts: 6,705 Thanks: 670  Re: Measures of dispersion: SD
In general no, since you need to know the distribution function. However in most statistics course the underlying distribution is assumed to be normal. In that case the answer is yes. Look up a table of the standard normal distribution (Google will give you many).


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