reliability based on the criteria of reliability. Furthermore, the reliability of the tests in this research was reliable.
I. Data Analysis
1. Fulfillment of Assessment
a. Normality Test
Normality is used to see whether the sample come from a population which is distributed normally.
19
In this case, the writer use Lilliefors test.
1 Arranging the sample’s data from the lowest until highest.
2 Determining the score Z from each data by using the following formula:
Zi =
x1 −x2
s
Notes: S
: Standard of deviation X
1
: Single datum X
2
: Coefficient of single datum 3
Counting the cumulative frequency of each Z score S z. Sz
i
=
Z1,Z2,Z3, ………Zn
n
4 Counting the differential of │F Zi – S Zi│
19
Sri Indah Pertiwi, Desmawati Radjab, Fitrawati, “The Effect of Using Cooperative
Integrated Reading Composition CIRC Teaching Model in Teaching Reading Narrative and Hortatory Exposition Text at Grade XI Senior High S
chool 1 Akabiluru”. Journal of English Language Teaching Vol. 1 No. 3 Serie A June 2013, p. 46.
5 Determining the L
observed
score with highest score, compare to the L
critical,
score from the table of Lilliefors. 6
Hypotheses formula are: H
a
: The data have normal distribution H
o
: The data do not have normal distribution 7
The test criteria: H
a
is accepted if L
observed
L
critical
, it means that the data are normal distribution.
H
o
is rejected if L
observed
L
critical
, it means that the data are not normal distribution.
b. Homogeneity Test
After the normality test, the writer determined the homogeneity of the test. Homogeneity is used to know whether two groups of sample is homogeny or
not.
20
The homogeneity test used the test of two variances. The writer used the formula as follows:
F =
�� ��
Notes: F
= Homogenous vb
= Biggest variant
20
Ibid.
vk = Smallest variant
The hypotheses are: H
o
: the variance of the data is homogenous H
a
: the variance of the data is not homogenous
In this case, the criteria for the criteria for the homogeneity test are: H
o
is accepted if F
observed
≤ F
critical,
it means the variance of the data is homogeneous.
H
a
is rejected if F
observed
F
critical
, it means the variance of the data is heterogeneous.
2. Hypothetical Test
Kategori