Table 5 Independent samples test of the effect of attending workshops on language achievement on posttest
|  | Levene’s test for equality of variances | t-test for equality of means | |||||||
|---|---|---|---|---|---|---|---|---|---|
F | Sig | t | df | Sig. (2-tailed) | Mean difference | Std. Error difference | 95% Confidence interval of the difference | ||
Lower | Upper | ||||||||
Posttest scores | |||||||||
 Equal variances assumed | 42.215 | .000 | 8.698 | 94 | .000 | 7.395 | .850 | 5.706 | 9.083 |
 Equal variances not assumed |  |  | 8.555 | 56.646 | .000 | 7.395 | .864 | 5.664 | 9.126 |