Validity and reliability of instrument Normality and Homogeneity Test

Standard Deviation score of Variable X Sum of squared gained score Variable X Number of the students d. Determining Standard Deviation Score of Variable Y, with formula: √ Standard Deviation score of Variable Y Sum of squared gained score Variable Y Number of the students e. Determining Standard Error Mean of Variable X, with formula: √ Standard Error Mean of Variable X =Standard Deviation of Variable X Number of the students f. Determining Standard Error Mean of Variable Y, with formula: √ Standard Error Mean of Variable Y =Standard Deviation of Variable Y Number of the students g. Determining Standard Error Mean of Difference Mean of variable X and Mean of Variable Y, with formula: √ Standard error of difference mean of variable X and mean of variable Y Sum of squared standard error mean of variable X Sum of squared standard error mean of variable Y h. Determining t with formula: t observation Mean of variable X Mean of variable Y Standard error mean of difference mean of variable X and mean of variable Y i. Determining t- table in significant level 5 and 1 with df. Degree of freedom Number of students control class Number of students experimental class

G. Statistical Hypothesis

The statistical hypothesis that was used in this study: H o : µ e ≤ µ c H a : µ e µ c Which: H o : Hypothesis null Ha: Hypothesis alternative µ e : Mean of the experimental class was taught by using computer assisted language learning. µ c : Mean of the controlled class was taught without using computer assisted language learning. 22

CHAPTER IV RESEARCH FINDINGS

A. The Description of Data

The data of students’ achievement was divided into two kinds, namely the data in experiment class and the data in controlled class, which was gained from pre-test and post-test that was applied in both of class. The pre-test was given to obtain the data about the students’ listening skill, it was held before the lesson began and the post-test was given after finishing the material teaching. The result of the test of experiment class will be explained in the following table: Table 4.1. The Score of Individual Students of the Experiment Class X No. Pre-Test Post-test Gained Score 1 60.3 73.7 13.4 2 40.2 53.6 13.4 3 33.5 53.6 20.1 4 46.9 60.3 13.4 5 60.3 73.7 13.4 6 46.9 67 20.1 7 33.5 67 33.5 8 67 93.8 26.8 9 40.2 53.6 13.4 10 53.6 67 13.4 11 46.9 67 20.1 12 40.2 60.3 20.1 13 60.3 80.4 20.1 14 33.5 53.6 20.1 15 33.5 53.6 20.1 16 60.3 67 6.7 17 60.3 67 6.7