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4.4 The T-test Analysis
In this chapter, the writer would like to determine the different achievement between experimental and control groups, which was reflected on the means
gathered. The writer would apply the t-test formula to count the difference. The t-test formula is:
Sudjana, 2005:239 The study was intended to investigate whether there was any significant
difference of ability in reading narrative text between the students taught using DR-TA method and those taught using conventional method.
To measure the significance of the pretest and the posttest, the t-test was used. T-value obtained from the computation should be consulted with the critical
value in the t-table. The result of the consultation was then used as an attempt to verify the hypothesis.
Before applying the t-test formula, the standard deviation should be computed first. The formula is as follows:
S 1 S
1 2
1 S
2 2
2
S ,
,
S ,
,
S ,
S ,
d a
t r
t C
s After
difference b as follows:
For a = 5
To int the t-table t
research, the table, it me
Contrary, if significant d
r that, the etween the e
and df = 30
terpret the t to check wh
e 5 0.05 eant that the
f the t-valu difference be
t-test formu experimenta
0 + 30 - 2 = 5
2.00 2,
obtained, it hether the di
level of sign ere was sig
ue was lowe etween two m
ula was ap al group and
58, t = 2,000
,774
should be c ifference wa
nificance is u gnificant dif
er than t-ta means.
pplied to m d the control
consulted wi as significan
used. If the t fference betw
able, it mea measure the
group. The
ith the critic nt or not. In
t-value is hig ween the tw
ant that ther
56
significant formula is
cal value of n education
gher than t- wo means.
re was no
57
The number of subjects in this study for the experiment and control groups were 60 with the degree of freedom df = 58, that was Nx + Ny
− 2 = 58. At the 5 0.05 alpha level of significance, t-value that was obtained was
, and t-table was 2,000, so the t-value is higher than t-table. It meant that
there was significant difference between two means. Therefore, there was significant difference in achievement between students who were taught reading
narrative text by using DRTA method and those who were taught by using conventional method. Below the t – table score:
t ‐table
Scores
d.b. Taraf
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