7. Determining Standard Error of different Mean of Variable X and Mean of Variable Y, with formula:
√
√ √
√
8. Determining t
o
with formula:
9. Determining Degrees of Freedom df, with formula:
The value of df 76 at the degrees of significance 5 or t
table
is 1.992. 10. The Testing of Hypothesis
The statistical hypothesis of this research can be seen as: Ho : There is no significant difference
between students’ writing skill in narrative text by using pictures series and without pictures series.
Ha : There is a significant difference between students’ writing skill in
narrative text by using pictures series and without pictures series.
And then, the criteria used as follows: 1. If t-test t
o
t-table t
t
in significant degree of 0.05, Ho null hypothesis is rejected.
2. If t-test t
o
t-table t
t
in significant degree of 0.05, Ho the null hypothesis is accepted.
C. Interpretation of the Data
In the description of the data which was taken from 39 students of experimental class, the writer could explain briefly about the data got from the
students before they were analyzed. The description of the experimental class which has the mean of pre-test 59.28 before using pictures series. After giving
4 times treatments for experimental class using pictures series, the writer got the mean of post-test 78.61. So, the writer got the mean of gain score 19.33.
The smallest score in the pre-test was 48 and the highest score was 66. The data showed in post-test that the smallest score was 74 and the highest score
was 80. It can be summarized that the lowest and the highest scores in post- test were higher than pre-test.
Meanwhile, from the description of score in controlled class which was the writer got the mean of pre-test 60.84. In this class, the writer did not give
the students pictures series, but the writer only give a theme to writing narrative text. After giving 4 times treatments without using pictures series,
the writer got the mean of post-test 76.58. The writer got the mean of gain score was 15.79. It means that the gain score of experimental class was higher
in the value 16 than controlled class. The smallest score in the pre-test was 52 and the highest score was 71. The data showed in post-test that the smallest
score was 72 and the highest score was 82. It can be summarized that the lowest and the highest score in post-test were also higher than pre-test.
Before testing the hypothesis, the writer analyzed the normality and homogeneity of the data. The purpose of analyzing the normality was to see
whether the data got in the research has been normally distributed or not. The result of normality can be seen by comparing the value of T
max
to T
table
.
