“…The results of the second hypothesis indicated that there is a medium positive correlation between problem-based learning and academic achievements referring to experimental group (r = 0.487), as well as to control group (r = 0.315). The result was consistent with previously reported works, who argued that there is a significant positive relationship between problem-based learning and academic achievement (Grabau and Ma, 2017;Odom and Bell, 2015;Post et al, 2006;Stecker, Fuchs and Fuchs, 2005;Philip et al, 2008;Kitchen et al, 2007;Harris, 2009;Coca, 2012;Mello et al, 2017;Moutinho, Moura and Vasconcelos, 2017;Casanoves, 2017;Andersson and Reimers, 2009). In conclusion the second hypothesis "there is a positive linear correlation between problem-based learning and academic achievements in science" is been supported.…”