Table 4.14 shows that the significance of posttest results between experimental and controlled class is 0.365. Therefore, it can be concluded that
both classes have the same variant because of 0.365 0.05. In other words, the data of pretest and posttest in both classes are homogen.
5. Hypothesis Testing
The last calculation was testing the hypothesis. This was the crucial calculation to answer the problem formulation of the research that whether
Directed Reading-Thinking Activity DR-TA strategy gives influence on students’ reading comprehension of narrative text or not. Comparative technique
was used to test the hypothesis in which the result tests pretest and posttest of both classes experimental and controlled class were compared as follows:
Table 4.15 The Comparison Score between Students in Experimental
Class X and Students in Controlled Class Y No
X Y
x = X-Mx y = Y – My
x
2
y
2
1 20
12 3
3.79 9.00
14.36 2
28 12
11 3.79
121.00 14.36
3 28
-4 11
-12.21 121.00
149.08 4
20 12
3 3.79
9.00 14.36
5 28
-8 11
-16.21 121.00
262.76 6
24 4
7 -4.21
49.00 17.72
7 16
12 -1
3.79 1.00
14.36 8
2 12
-15 3.79
225.00 14.36
9 8
8 -9
-0.21 81.00
0.04 10
16 4
-1 -4.21
1.00 17.72
11 8
8 -9
-0.21 81.00
0.04 12
8 12
-9 3.79
81.00 14.36
13 16
8 -1
-0.21 1.00
0.04 14
12 12
-5 3.79
25.00 14.36
15 12
4 -5
-4.21 25.00
17.72 16
8 -4
-9 -12.21
81.00 149.08
17 20
8 3
-0.21 9.00
0.04
No X
Y x = X-Mx y = Y
– My x
2
y
2
18 4
4 -13
-4.21 169.00
17.72 19
12 16
-5 7.79
25.00 60.68
20 16
12 -1
3.79 1.00
14.36 21
24 4
7 -4.21
49.00 17.72
22 28
16 11
7.79 121.00
60.68 23
8 16
-9 7.79
81.00 60.68
24 12
-5 -8.21
25.00 67.40
25 28
28 11
19.79 121.00
391.64 26
16 28
-1 19.79
1.00 391.64
27 20
4 3
-4.21 9.00
17.72 28
8 4
-9 -4.21
81.00 17.72
29 24
4 7
-4.21 49.00
17.72 30
24 -8
7 -16.21
49.00 262.76
31 36
19 -8.21
361.00 67.40
32 12
24 -5
15.79 25.00
249.32 33
12 20
-5 11.79
25.00 139.00
34 24
8 7
-0.21 49.00
0.04 35
16 12
-1 3.79
1.00 14.36
36 20
20 3
11.79 9.00
139.00 37
28 -8
11 -16.21
121.00 262.76
38 -4
-17 -12.21
289.00 149.08
∑ = 38 646
312 2702
3134.32
The data were calculated based on the step of the test. The formulation is as follows:
1. Determining mean of variable XM
x
, with the formula: =
∑ =
= .
2. Determining mean of variable YM
y
, with the formula: =
∑ =
= .
3. Determining of standard of deviation X SD
x
, with the formula: �
= √ ∑
2
= √ = √ .
= .
4. Determining of standard of deviation YSD
y
, with the formula: �
= √ ∑ ²
= √
.
= √ . = .
5. Determining of standard errors mean of variable XSE
mx
, with the formula:
� � = �
√ − =
. √
= .
. = .
6. Determining of standard errors mean of variable YSE
my
, with the formula:
� � = �
√ − =
. √
= .
. = .
7. Determining of standard errors of different mean of variable X and mean of variable Y, with the formula:
� � − = √� � ² + � � ²
= √ .
2
+ .
2
= √ . + . = √ .
= .
