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Any statistics pros out there?

I

Isocene

Senior member
I'm in graduate school right now and taking a statistics course. My professor assigned one question for us to try to find and answer using any resource.

So, if anyone is interested in helping me out here is a link(has subscript so I made a screenshot):

Question

Any help would be much appreciated.
 
hmmm, lol, I haven't taken stats in a year, and as far as I know I'm wrong, but it could be related to three standard deviations.
 
Variance is just the square of standard deviation. If the larger standard deviation falls within 3 times that of the smaller, you conclude they're in the same general range. This may be related to the idea of outliers. Generally, extreme outliers have to be more than 3 times the standard deviation from the mean. Anything giving a ratio of <= 3 in the provide equation isn't an extreme outlier, and therefore can be used in pooled formulas.
 
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