43
Table 3.6 Validity Test Item
r-count r-table
Status
1
0.080 0.334
Drop
2
0.366 0.334
Valid
3
0.440 0.334
Valid
4
0.520 0.334
Valid
5
0.591 0.334
Valid
6
0.484 0.334
Valid
7
0.378 0.334
Valid
8
0.063 0.334
Drop
9
0.431 0.334
Valid
10
0.415 0.334
Valid
11
-0.220
0.334 Drop
12
0.537 0.334
Valid
13
0.507 0.334
Valid
14
0.347 0.334
Valid
15
0.364 0.334
Valid
16
0.759 0.334
Valid
17
0.731 0.334
Valid
18
0.530 0.334
Valid
19
0.654 0.334
Valid
20
0.450 0.334
Valid
21
0.428 0.334
Valid
22
0.604 0.334
Valid
23
0.538 0.334
Valid
24
0.595 0.334
Valid
25
0.490 0.334
Valid
26
0.403 0.334
Valid
27
0.083 0.334
Drop
28
-0.041 0.334
Drop
Based on the table above, it can be seen that there were 5 numbers of item which were invalid, number 1, 8, 11, 27, and 28 see appendix
1.
2. The Reliability of Instrument
Reliability test conducted to determine the consistency of the interval among the variables and instruments. The point about item
tested was matter which valid. Looking for reliability interval method
44
used was Cronbach Alpha method, which analyzed the reliability of this method of measuring instruments from on measurement.
2 2
11
1 1
t i
n n
r
Keterangan :
r
11
: Reliability score
i 2
: total variance score
t 2
: total variance n : item score
According to Sudjono 2001, the criteria of instrument reliability r
11
was stated as follow: If r
11
was equal or higher than 0.7, it means that the instrument was reliable.
If r
11
was lower than 0.7, it means that the instrument was unreliable. Based on trying out reading interest instrument which had been done to
35 participants, there were 23 statements of reading interest questionnaire valid and reliable with reliability 0.865 0.7. It could be concluded that
the test of instrument in this study was reliable. See appendix 1
2 Instrument for reading comprehension
a. Conceptual definition
Reading comprehension was a process to gain the meaning which actively involved knowledge and experience possessed by
readers, connected to the content of the passage. There were three things in reading comprehension: 1 knowledge and experience about
certain topic, 2 link back the knowledge and experience to the passage which will be read, 3 the process to gain the meaning
actively according to view heshe possesses.
b. Operational definition
Operationally, reading comprehension was measured through a score gained by the student from objective test, consist of: 1
comprehension in answering the questions given, 2 finding out the main idea of the passage, 3 pointing out the reference, 4 implying
the content of the passage. The objective test was a sub-set of test with multiple choices given option A, B, C, and D. It meant one
correct answer, while the others were to be the distracters. The correct answer would be graded 1, and the wrong answer would be graded 0.
Total items of the instrument were 30 items. It brings consequence that the lowest score will be 0, while the highest score will be 30.
