What is this Statistical Formula Used to Calculate?

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The formula discussed is related to the two-mean hypothesis test, specifically for comparing the means of two groups. It calculates the difference between the sample means (x1 and x2) relative to the pooled standard deviation (s) and the sample sizes (n1 and n2). The formula is structured to assess whether there is a statistically significant difference between the two means. An attachment was provided for reference, and a link to a resource with similar formulas was shared for further clarification. Understanding this formula is crucial for conducting hypothesis testing in statistics.
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great forum, been looking at some past papers and saw this formula in a stats paper - don't know what it is. i want to know as it is used to calculate a question. please help...
its put up as an attachment...

or...

t = x1 - x2 / s (√ 1/n1 + 1/n2)

the x's are x bar

thanks in advance...
 

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Looked familiar, so I glanced around; it looks like the two-mean hypothesis test, where s_1 = s_2
(i.e. the formula I found for the two-mean hypothesis test was the same as yours, except the s was under the square root as s_1 and s_2 squared.)
Here:
http://www.duxbury.com/statistics_d/templates/student_resources/0534377556_woodbury/artfinal/Formulas/Formula%205.jpg
 
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