2011 Volume 2 Issue 2 Pages 2_119-2_125
The evaluation for experimental performance was analyzed by statistical method through watching video on university teaching laboratory class, which was aimed for proposing a new method of safety training on the class. The analysis was conducted on an experiment of Friedel-Crafts reaction in university teaching laboratory class which was attended by third year undergraduate chemistry students. Firstly, randomly chosen seventeen students were filmed their experimental performance in the class. A person who was familiar with chemistry experiments gave grades to the students on fifty points in five levels. Exploratory Factor Analysis (EFA) with Principle Factor Method for the evaluated grade produced three factors: "Predictive capabilities", "Technical capabilities", and "Observational capabilities" as potential criteria of good-or-bad judgment for experimental performance. Secondly, the 9 delimited procedures of the experimental textbook for the teaching laboratory class were graded by the same person. By performing correlation analysis between the noted three factors and the grades, it was indicated that the strength of influence of factors on operator's experimental skills could differs depends on each experimental procedure and that similar experimental procedures could correlate different factors. Specifying the strength of correlation between experimental performance at each procedure and basic experimental capabilities seems to indicate a possibility of developing a new methodology for safety training on teaching laboratory class such as a prediction method for detecting an experimental procedure which shows weak relationship between operator and operation.
