Group Statistics Std. Error group N Mean Std. Deviation Mean 20 27.15 12.508 2.797 2 20 11.95 14.612 3-267 Independent Samples Test Equal variances Equal variances assumed not assumed Levene's Test for F 1.877 Equality of Variances Sig -179 1-test for Equality of t 3-534 3-434 Means df 37.417 Sig. (2-tailed) Mean Difference 15-200 15 200 Std. Error Difference 4.301 4.301 95% Confidence Interval Lower 6:491 6.486 of the Difference Upper 23-907