F. The Technique of Data Analysis
Data analysis was the last step of the research that was done as one of the procedures of experiment. In this case, the writer calculated the data which
was obtained from the research. The objective of data processing is to know students’ learning achievement of both experiment class and control class.
After getting the data from pre-rest and post test of both experiment class and control class, the writer compared the result of both class to know the average
score of each class. This technique is used to know whether there is significant difference of students
’ achievement that are taught degree of comparison through pictures and
students’ achievement who are taught degree of comparison without using picture or through conventional teaching method.
Anas Sudijono highlighted, to test the difference between two means is used t-test formula as following below.
8
t =
M
1
−M
2
SE
M 1 −M2
�
1
: Mean of the Difference of Experiment Class �
2
: Mean of the Difference of Control Class ��
�1
: Standard Error of Experiment Class ��
�2
: Standard Error of Control Class
The Procedur of calculation were as follows: 1. Determining Mean of Variable X, the formula is:
M
1
= X
N
1
2. Determining Mean of Variable Y, the formula is: M
2
= Y
N
2
8
Anas Sudijono, Pengantar Statistik Pendidikan, Jakarta: Raja Grafindo Persada, 2005, p. 324-235.
3. Determining Standard of Deviation Score of Variable X, the formula is: SD
1
= X
2
N
1
4. Determining Standard of Deviation Score of Variable Y, the formula is: SD
2
= X
2
N
2
5. Determining Standard Error of Mean of Variable X, the formula is: SE
M
1
= SD
1
N
2
− 1
6. Determining Standard Error of Mean of Variable Y, the formula is: SE
M
2
= SD
2
N
2
− 1
7. Determining Standard Error of Difference of Mean of Variable X and Variable y, with formula:
SE
M
1
−M
2
= SE
M
1
2
+ SE
M
2
2
8. Determining t with formula:
t =
M
1
−M
2
SE
M1 −M2
9. Determining t-table in significance level 5 with degree of Freedom df: df =
N
1
+ N
2
− 2
Variable X : Teaching Degree of Comparison by Using Picture
Variable Y : Teaching Degree of Comparison without Using Picture
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