Question: . ttest wage, by (union) Two-sample t test with equal variances Group Obs Mean Std. Err. Std. Dev. [95% Conf. Interval] nonunion 1417 7. 204669

. ttest wage, by (union) Two-sample t test with equal variances Group Obs Mean Std. Err. Std. Dev. [95% Conf. Interval] nonunion 1417 7. 204669 . 1090159 4. 103694 6.990819 7. 418519 union 461 8 . 674294 . 1944277 4. 174539 8 . 292218 9. 056371 combined 1878 7.565423 . 0961874 4. 168369 7.376778 7. 754069 diff -1. 469625 2209702 -1. 902999 -1. 036252 diff = mean (nonunion) - mean (union) t = -6. 6508 Ho: diff = 0 degrees of freedom = 1876 Ha: diff 0 Pr (T |t| ) = 0.0000 Pr(T > t) = 1.0000 What was the observed sample mean in this sample? O -1.4696 OO O 0.221 O 7.565

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