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...(adsbygoogle = window.adsbygoogle || []).push({});

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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# What formula is this?

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