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May 23rd, 2013, 06:25 PM   #1
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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.
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May 24th, 2013, 12:42 PM   #2
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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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