This study examines the effectiveness of a CAI system on students' academic achievement. After developing an experimental hypermedia CAI system, an experiment using this system on a group of elementary school students was performed, and the data from the experiment were then analyzed statistically. An experimental hypermedia CAI system with an emphasis on improving reading skills was developed using Hanoi 3.0 on an IBM compatible PC. The pedagogical material for this experimental system came from the first chapter of a standard social science textbook for fifth grade students in Korea. The study involved 55 students in total, who were divided into an experimental group of 27 students and a control group of 28 students. For the final 15 minutes of a 40-minute class, the experimental group studied with the experimental hypermedia CAI system, while the control group studied in the traditional manner. This experiment was repeated for 19 class hours. A post-test with 30 questions designed to measure academic achievement was conducted on both groups of students at the end of the experiment. The average and the standard deviation of scores for the experimental group are 25.18 and 3.43 respectively, and 22.57 and 2.96 for the control group. In order to determine whether academic achievement for the experimental group was better than that of the control group, a t-test on the two populations was performed at the 5% level of significance. From the analysis of the t-test, it is concluded that the academic achievement for the experimental group is significantly better than that of the control group. This fact tells us that the experimental hypermedia CAI system had a positive effect on the students' academic achievement.
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