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
10 60 61 121 14641
11 68 65 133 17689
12 71 70 141 19881
13 65 63 128 16384
14 60 61 121 14641
15 60 62 122 14884
16 68 67 135 18225
17 63 64 127 16129
18 65 65 130 16900
19 63 63 126 15876
20 65 65 130 16900
21 67 66 133 17689
22 63 65 128 16384
23 65 63 128 16384
24 61 63 124 15376
25 60 62 122 14884
26 61 61 122 14884
27 60 63 123 15129
28 66 64 130 16900
29 61 62 123 15129
30 60 61 121 14641
31 62 62 124 15376
32 63 62 125 15625
33 62 63 125 15625
34 62 62 124 15376
35 60 63 123 15129
36 61 61 122 14884
37 60 61 121 14641
38 61 62 123 15129
39 60 61 121 14641
40 63 63 126 15876
R 2525 2555 5080 646664
R
2
6375625 6528025 12903650 n =
40 k =
2
ΣR = 5080
ΣR
2
= 12903650 ΣT
= 5080 ΣT
2
= 646664 Σi
= 5080 Σi
2
= 323402 Σi
2
- ΣR
2
n - ΣT
2
k + Σi
2
nk S
e 2
= n-1k-1
323402 322591
323332 + 322580 S
e 2
= 39
= 1.506 ΣT
2
k - Σi
2
nk S
s 2
= n-1
323332 322580
= 39
= 19.28 Ss
2
- Se
2
17.776
r
xx
= Ss
2
= 19.282
= 0.92
The average estimation of panelists reliability as follows:
Ss
2
- Se
2
r
xx
= Ss
2
+ k-1Se
2
17.776 =
20.788 = 0.855
Where: Se² : variance error
S
s
² : variance inter-subject r
xx :
the average of reliability r
xx :
the average estimation of reliability i
: rating score that given by a rater to a subject T : the total of rating score that accepted by a subject from the raters
R : the total of rating score that given by a rater to all subjects n : the number of subject
k : the number of rater Based on the computation above, both the researcher and the English
teacher of SMA NU 01 Al-Hidayah Kendal were reliable to be panelists.
4.1.2 Pre and Post-Test Finding
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