B. Data Analysis and Hypothesis Testing
1. Analysis of Pre-test and Post-test
a. Normality
A normality test is needed to find out whether the hypothesis of the research has been normally distributed or not; the data are homogeneous or
heterogeneous. This test is scored by using SPSS Statistic 17. The normality test can be seen as follow:
Table 4.3 Normality of Pre-test Using One-Sample Kolmogorov-Smirnov Test
One-Sample Kolmogorov-Smirnov Test
CONTROL EXPERIMENT N
25 25
Normal Parameters
a,,b
Mean 58.64
55.60 Std. Deviation
10.839 12.359
Most Extreme Differences
Absolute .136
.155 Positive
.136 .155
Negative -.121
-.118 Kolmogorov-Smirnov Z
.679 .774
Asymp. Sig. 2-tailed .745
.587 a. Test distribution is Normal.
b. Calculated from data.
Table 4.4 Normality of Pre-test Using Liliefors
Kolmogorov-Smirnov
a
Shapiro-Wilk Statistic
df Sig.
Statistic df
Sig. CONTROL
.136 25
.200 .934
25 .107
EXPERIMENT .155
25 .125
.937 25
.123 a. Lilliefors Significance Correction
. This is a lower bound of the true significance.
The normality calculation above used One-Sample Kolmogorov-Smirnov Test and Liliefors. From the table above, it is shown the absolute difference D of
controlled class data is 0.136. It is lesser than D
table
with the closest Kolmogorov- Smirnov critical points of 25 = 0,264. Besides, from the Lilliefors test, it shows
that the normality is significant. So, it can be concluded that the data is normal as
what has been written down exactly below the table.
Table 4.5 Normality of Post-test Using One-Sample Kolmogorov-Smirnov Test
One-Sample Kolmogorov-Smirnov Test
CONTROL EXPERIMENT N
25 25
Normal Parameters
a,,b
Mean 66.00
68.40 Std. Deviation
11.180 9.323
Most Extreme Differences
Absolute .144
.202 Positive
.144 .202
Negative -.110
-.161 Kolmogorov-Smirnov Z
.721 1.012
Asymp. Sig. 2-tailed .676
.258 a. Test distribution is Normal.
b. Calculated from data.
Table 4.6 Normality of Post-test Using Liliefors
Kolmogorov-Smirnov
a
Shapiro-Wilk Statistic
df Sig.
Statistic df
Sig. CONTROL
.144 25
.191 .957
25 .355
EXPERIMENT .202
25 .010
.949 25
.241 a. Lilliefors Significance Correction
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