Paired t test
Variable Obs Mean Std. Err. Std. Dev. [95% Conf. Interval]
x2 657 -2.13e-08 .003481 .0892261 -.0068354 .0068353
x4 657 -3.32e-08 .0063649 .1631442 -.012498 .0124979
diff 657 1.19e-08 .0068363 .1752284 -.0134237 .0134237
mean(diff) = mean(x2 - x4) t = 0.0000
Ho: mean(diff) = 0 degrees of freedom = 656
Ha: mean(diff) < 0 Ha: mean(diff) != 0 Ha: mean(diff) > 0
Pr(T < t) = 0.5000 Pr(T > t) = 1.0000 Pr(T > t) = 0.5000


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