<![CDATA[This study aims to determine the effect of the discovery learning model on student learning outcomes on simple aircraft material in class VIII UPT SMP Negeri 12 Medan. The research method used was a quasi experiment with a population of 284 students of class VIII UPT SMP Negeri 12 Medan. The sampling technique used was purposive sampling, namely class VIII 6 and VIII 7 each as an experimental class and control class. The instrument used was a multiple choice test of learning outcomes as many as 20 questions. Before being given treatment, a prerequisite test was first carried out to determine whether the sample came from a normally distributed and homogeneous population. Furthermore, the pretest was given to the experimental class and control class with an average score of 48.83 and 48.67 respectively with a standard deviation of 16.59 and 16.45, After the treatment was followed by giving the posttest, the average score was 80.83 and 66.00 respectively with a standard deviation of 11.52 and 15.05. To see the difference in the two classes, a one-sided t-test was conducted with = 0.05, it was found that the t-count was greater than the t-table which indicated that there was a difference in learning outcomes in the two classes. Furthermore, the magnitude of the effect of the discovery learning model on learning outcomes was carried out a simple regression test, with the equation "Y" ̅ = "57.19 + 0.11X". Finally it was concluded that there was a significant effect of the discovery learning model on the learning outcomes of students of SMP Negeri 12 Medan on simple aircraft material.]]>
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