Question 975182
t=[(x1-x2)-(mu1-mu2)]/ sqrt {(s1^2)/n1) +(s2^2)/n2)}

I get a t-value of -3.1, which from the table at 26 df has a p-value between 0.005 and 0.025 (calculator 0.023).

I get a SE of 0.666
t value *SE= +/-2.056*(0.666)=1.37

CI is -2.07 +/- 1.37   difference in means +/- tSE
95% CI = (-3.44,-0.70)


The CI does not contain zero; therefore, there is a significant difference between these means at the p=0.05 level.