As shown in Figure 3&4, the distribution of students’ listening scores in pre-test and post-test was slightly
different. Before taking the course, the distribution of total scores was normally distributed. Only several were
found to fall on both the higher and lower score range of the scale. After the taking the course, the distribution of
total scores showed a rightward skew. More students moved to the higher-score range. In addition, the number of
students on the lower score range dropped sharply.