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Independent samples t-test of posttest results for two groups.
| Levene's test for equality of variance | t-test for equality of means | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| F | Sig. | t | df | Sig. (2-tailed) | Mean difference | Std. Error Difference | |||
| Lower | Upper | ||||||||
| Equal variance assumed | 1.584 | .219 | −12.553 | 28.000 | .000 | −15.80000 | 1.25862 | −18.37817 | −13.22183 |
| Equal variance not assumed | −12.553 | 26.276 | .000 | −15.80000 | 1.25862 | −18.38581 | −13.21419 | ||
