17. 20
15 10
15 15
75 18.
15 15
15 15
15 75
∑ 275
280 265
280 270
1365 Mean
15.3 15.6
14.7 15.6
15.0 75.8
Based on the table above, it can be conclude that scores of posttest in experimental group got some improvement. The mean of posttest of
experimental group was 75,8. It means that mean score of experimental group increase about 14,7 points.
c. Analysis of posttest
Posttest is conducted to both of experimental and control groups in the same week after receiving the treatment. The purpose of posttest is
to know whether there is improvement in the students’ achievement of experimental group. The result of the posttest score and mean of the
experimental and control groups are presented in following table:
Table 4.6
The Result of Total Score and Mean of Experimental And Control Group Group
N Total Score Mean
Experimental Group 18 1365
75,8 Control Group
18 1100
61,1
200 400
600 800
1000 1200
1400 1600
Experimental Group
Control Group Series 1
Column1 Column2
10 20
30 40
50 60
70 80
Experimental Group Control Group
Series 1 Series 2
Series 3
Chart 4.3
Chart total score posttest of experimental and control group
Chart 4.4
Chart mean posttest of experimental and control group
20 40
60 80
100
Experimental Group
Control Group Pretest
Posttest Improvement
The chart shows that the sum of the posttest is 1365 for experimental groups and 1100 for control groups. While the mean of
posttest score of the experimental group is 75,8 and the control group is 61,1.
From the result of pretest and posttest scores of experimental group, we could see that the posttest score is higher than pretest. It would be
compared with pretest to find out the improvement. The improvement can be seen through the following:
Table 4.7 The improvement of Experimental and control Group
Group Mean
Pretest Posttest
Improvement Experimental
Group 58,9
75,8 16,9
Control Group 58,1
61,1 3
Chart 4.5 the improvement of experimental and control group
From the table above, it shows that the mean difference of experimental class is higher than control class. The score of experimental
group mean difference is 16,9, whereas in control group is mean difference is 3. It can be concluded that the treatment given by timeline
strategy has more influence than traditional technique. Overall improvement between pretest and posttest score of
experimental group is higher than the control group. Then the researcher calculates the two mean posttest score by using t-test formula to know
whether the improvement is significant or not.
d. Analysis of Significance
After the researcher gives the pretest, treatments and posttest then the researcher calculates the different mean of pretest and posttest score
between experimental and control groups to know whether the result of timeline strategy is significant or not between both of groups. Then the
result is analyzed using t-test formula. Before it is done, the standard deviation of the two groups is calculated first.
1.1 Standard Deviation and variance of Experimental and Control
Group a.
Experimental group
Variance
�
� 2
=
�
�
−�
2
�
�
−1
= 212,52
17 =12,50
Standard Deviation �
�
= 12,5
=3,53 b.
Control group
Variance �
� 2
=
�
�
−�
2
�
�
−1
=
227,78 17
=13,40
Standard Deviation �
�
= 13,40
=3,66 Table 4.8
The result of calculation is presented in this table: Group
N Mean
Variance Experimental Group
18 3,53
12,50 Control Group
18 3,66
13,40
1.2 T-test
