Question 322827
t = [(x1bar-x2bar)-(u1 - u2)]/[sqrt[s1^2/n1 + s2^2/n2]
df = smaller of n1-1 and n2-1
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Note: I ran a 2-SampleT test on my TI-84 calculator 
and got a test statistic of t = -2.5372
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Cheers,
Stan H.