The accounted t-value has been found as [t(64)= 3.26]. The students in the experiment group [ X experimental= 73.3]showed significantly better achievement compared to the students in the control group [ X control= 62.3]. Soaccording to these results, it can be said that there is statistically significant difference between the post-testscores of the two groups in .05 level [p= .0018, p<.05]. When one looks at the average scores of the groups, itcan be seen that the students in the experiment group have reached a higher achievement level compared tothose in the control group. The experimental method, which is project-based learning, applied has been moreeffective than the instruction based on student textbooks in the control group.Analysis of the Second Research QuestionThe second research question of the study was ―Is there a significant difference between the attitudelevels of the students in the experiment group and the students in the control group towards the lesson in termsof the usage of project-based learning?‖ So, before the treatment an independent samples t-test was employed inorder to determine whether a statistically significant mean difference existed between the experimental and thecontrol groups with respect to their pre-attitude towards English lesson. The comparison of pre-test results of thestudents in the experimental and the control groups are presented in Table 4.Table 4. Comparison of Pre-Test Attitude Scores of the Students in the Experiment and the Control GroupsGroups η X Std. Dev. df t pExperimental 30 1.58 0.50264 -0.247 0.81*Control 30 1.61 0.496*p>.05In Table 4 given, the pre-test attitude scores of the students in the experiment and the control groups canbe seen. The average pre-test attitude score of the students in the experiment group has been found as Xexperimental= 1.58±0.502; and the average pre-test attitude score of the students in the control group has been foundas X control= 1.61±0.496. The accounted t-value between the average scores of the two groups is [t(64)= -0.247].The data obtained are not statistically significant in .05 level since the pre-test attitude scores of the students ofthese two groups are similar.Table 5. Comparison of Post-Test Attitude Scores of the Students in the Experiment and the Control GroupsGroups η X Std. Dev. df t pExperimental 30 2.73 0.45264 6.16 0.0001*Control 30 2.03 0.467*p<.05The post-test attitude scores of the students in the experiment group and the control group can be seen inTable 5. The average post-test attitude score of the students in the experiment group has been found as Xexperimental= 2.73±0.452; and the average attitude post-test score of the students in the control group has beenfound as X control= 2.03±0.467. The t-value obtained from the average scores of the two groups has been foundas [t(64)= 6.16], which shows the statistically significant difference [p= .0001, p<.05] between the groups. In light
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