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Algebra, two-sample t-statistic, variance

 
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Aug6-12, 02:11 AM   #1
 

Algebra, two-sample t-statistic, variance

Could some help with a question? Any hints or directions on how to approach would be greatly appreciate it.

The question: http://s12.postimage.org/kvtyiacuj/question.png

Thanks!
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Aug6-12, 03:11 PM   #2
 
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