Effects of science instruction using key elements of engineering design and graphic organizers technique on ability in analysing and doing science projects of secondary school students
Abstract:
This study was a quasi-experimental research. The purposes were to (1) study ability in doing science projects, (2) study ability in analysing and its three components of secondary students after learning through the science instruction using key elements of engineering and graphic organizers technique, and (3) compare ability in analysing and its three components between before and after learning through the science instruction using key elements of engineering and graphic organizers technique. The sample was one classroom with 23 students of grade eleven of Nonsi Withaya School in second semester of academic year 2011, which selected by purposively sampling. The research instruments were 1) the form for evaluating doing science projects with IOC at 0.85 and inter-rater reliability at 0.91 and 2) the test on analysing ability with the reliability at 0.76, the mean item of difficulty was at 0.69, and the mean of discrimination was at 0.45. The collected data were analyzed by arithmetic mean, mean of percentage, standard deviation, and t-test. The research findings were summarized as follows: 1.The mean percentage score of ability in doing science projects of secondary school students was 81.67 percent, which was higher than the criterion score set at 70 percent, and rated as very good. 2.The mean percentage score of ability in analysing of secondary school students was 65.4 percent, which was higher than the criterion score set at 65 percent. Also, the mean percentage score of its three components were higher than the criterion score set at 65 percent as well. 3.The mean percentage score of the experimental group in post-test on ability in analysing was higher than the pre-test mean percentage score at .05 level of significant. However, its three components mean percentage score in post-test was not statistically higher than the pre-test mean percentage score at .05 level of significant.