Group Statistics Group N Mean Std. Deviation S.E. Mean GSW experience Introvert 11 3.91 70 21 Extrovert 13 4.00 00 100 Sleep hours Introvert 10 6.65 1.20 38 Extrovert 3 7.67 58 33 Independent Samples Test Levene's Test for Equality of Variances T-Test for Equality of Means 95% Confidence Interval Sig. (2- Mean Std. Error of the Difference F Sig. of tailed Difference Difference Lower Upper GSW Equal variances 3.16 101 .22 12.00 831 09 42 -1.00 82 experience assumed Equal variances -.43 10.00 676 .09 21 -.56 38 not assumed Sleep hours Equal variances 1.59 233 -1.38 11.00 194 1.02 .73 -2.63 60 assumed Equal variances 2.01 7.70 081 1.02 51 2.19 16 not assumed