Table 3-3 indicates that both classes made progress in English learning after the experiment. The average score of
the EC is 79.67 and average score of the CC is 71.14. The average score of the EC is much higher than that of the
CC. It shows the significant differences between two classes. For Z=4.2>1.96. On the other hand, the table shows us
that standard deviation is 7.31 in the EC, meanwhile, 11.23 in the CC. The gap between these two classes is too big: