Measures of dispersion: SD

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Xtal

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May 21, 2013
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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.
 
If you have a Standard Normal Distribution, it makes perfect sense and refers to what is often known as "The Empirical Rule".
 
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