3.7 Method of Analyzing Data
The researcher analyzed the data by using t-test technique. The following are the steps in analyzing the data by using t-test technique:
1. Making preparation table.
Table 3.3 T-test Preparation Table Format
Experiment Group E Control Group C
No Pre test X
1
Post test Y
1
Pre test X
2
Post test Y
2
1. 2.
3. -
- -
- 40.
Total Mean
Variance Standard
deviation
2. Measuring the data To measure this data in order to find the mean of pre test and post test
of the variable, the researcher uses the formula: The mean of pre test
1 1
1
N X
X
∑
=
2 2
2
N X
X
∑
=
The mean of post test
1 1
1
N Y
Y
∑
=
2 2
2
N Y
Y
∑
=
3. Finding Variance Variance from two groups can be found with this following formula:
1 Experiment Group: Variance of pre test
2 1
1 2
1 2
1
X N
X −
=
∑
α
2 1
1 2
1 2
2
Y N
Y −
=
∑
α
Variance of post test
2 Control Group: Variance of pre test
Variance of post test
2 2
2 2
2 2
1
X N
X −
=
∑
α
2 2
2 2
2 2
2
Y N
Y −
=
∑
α
4. Measuring the data using t-test
The next step is measuring the data using t-test, namely: t-test
for pre test:
⎟⎟ ⎠
⎞ ⎜⎜
+ ⎟
⎜⎜ − 1
1
N N
⎝ ⎛
− ⎟
⎠ ⎞
⎝ ⎛
− =
1
2 2
2 1
2 2
1 1
X X
t
α α
t-test for post test:
⎟⎟ ⎠
⎞ ⎜⎜
⎝ ⎛
− +
⎟⎟ ⎠
⎞ ⎜⎜
⎝ ⎛
− −
= 1
1
2 2
2 1
2 1
2 1
2
N N
Y Y
t
α α
5. Measuring Significance The next step is measuring the significant scale by considering
the significance score, they are: 1 Identifying the suitable degree of freedom df .
2 Choosing the t crisis rate based on the table. 3 Stating the significant.
CHAPTER IV DATA ANALYSIS
In this chapter, the data obtained from the investigation would be analyzed by using the formula in chapter III.
4.1 Research Finding
The data were obtained from the students’ scores achievement of the writing test. They were pre and post-test scores from the experimental and control group.
4.1.1 Try Out Finding
Before conducting a pre-test, a try out was done to another class. The students’ scores were marked by two persons; they are the researcher herself and the
English teacher of SMA NU 01 Al – Hidayah Kendal. The result of try out from the first and second rater panelists then computed to
find out the reliability. In this research, the researcher used the Reliability of Panelist. Here the computation:
Table 4.1 The Result of Reliability of the Panelists
Panelists Students
I II T T
2
1 60 65 125 15625
2 73 75 148 21904
3 70 74 144 20736
4 61 65 126 15876
5 63 62 125 15625
6 62 63 125 15625
7 65 66 131 17161
8 62 64 126 15876
9 63 65 128 16384
27
Kategori