Scheffe's test was administrated to identify the sources of the differences between more than two groups. Furthermore, effect size (eta-squared) values of independent variables over the dependent variable were analyzed. Effect size was considered as "low" if 0.01 ≤ n2 < 0.06 and as "moderate" if 0.06 ≤ n2 < 0.14 and "high" if n2 ≥ 0.14 Data were analyzed using SPSS 15.0. Level of significance was set at .05.