Table 2: Independent samples -test of pretest results between two groups.

Levene’s Test for equality of variance -test for equality of means       Sig. df   Sig.  (2-tailed)  Mean difference Std. error difference Lower Upper Equal variance assumed 11.636 .002 −1.274 28 .213 −1.3333 1.04623 −3.47644 .80978 Equal variance not assumed     −1.274 21.056 .216 −1.3333 1.04623 −3.50874 .84207