2 The p value or the post-test for the experimental group 0.558 was greater than
α 0.05. It means that the data of the post-test of the experimental group had a normal distribution.
3 The p value or the pre-test for the control group 0.180 was greater than α
0.05. It means that the data of the pre-test of the control group had a normal distribution.
4 The p value or the post-test for the control group 0.330 was greater than α
0.05. It means that the data of the post-test of the control group had a normal distribution.
Briefly, p value of pre-test and post-test in experimental and control class were greater than the significant level of 0.05. It means that the data distribution
of students’ writing ability had a normal distribution.
b. Homogeneity Test
The homogeneity test was used to find out whether the sample variance is homogeneous or not. In this case, the Levene-Test of ONE WAY ANOVA was
employed on the data of pre-test and post-test. The relationship can be considered homogeneous if the significant value is higher than level of significance of 0.05.
The homogeneity test was done in writing ability before and after the treatment pre-test and post-test. It used SPSS 13.00 computer program for
windows, the results are shown in Table 20. The complete computation is enclosed in Appendix C.
Table 20: Result of the Homogeneity Test in Pre-Test Levene Statistic
df1 df2
Sig. Interpretation
Writing Ability
2,073 1
62 0.155
Homogeneous
Table 20 shows that the value of p Sig. of the pre-test 0.155 is greater than 0.05. It means that the sample variance was homogenous.
Table 21: Result of Homogeneity Test in Post-Test Levene Statistic
df1 df2
Sig. Interpretation
Writing Ability
0.340 1
62 0.562
Homogeneous
Table 21 shows that the value of p Sig. of the post-test 0,562 is greater than 0.05. It means that the sample variance was homogenous.
2. Hypothesis Testing
The hypothesis testing was aimed at revealing whether there is a significant difference in writing ability between students who are taught by
inquiry-based learning strategy and those who are not taught by using inquiry- based learning strategy. Firstly, the hypothesis must be changed to the null
hypothesis Ho before the hypothesis was rejected or accepted. The hypothesis testing can be seen from the following explanation:
a. Null Hypothesis Ho: There is no significant difference in writing ability between students who are taught using inquiry-based learning strategy and
those who are not taught by using inquiry-based learning. b. Alternative Hypothesis Ha: There is significant difference in writing
ability between students who are taught using inquiry-based learning
