51
Table 3.2 Likert Scale Category
Score Strongly Agree
5 Agree
4 Neutral
3 Disagree
2 Strongly Disagree
1
Sugiyono 2011:135
The rating scores range from 20 to 100 interval 80 and the questionnaire employs five categories. So, the choices of statements are the data of students
which are ranged into five categories as in the following table:
Table 3.3 The Rating Score of the Students’ Perception
Category Range
Very High 84
– 100 High
68
– 83 Moderate
52
– 67 Low
36
– 51 Very Low
20 - 35
Mido cited in Wanci 2014:55
The data were analyzed by the following formula:
P = nk
N x 100
Notes : P
: Percentage from questionnaire nk
: Number of frequency N
: Total samples Arikunto 2010: 324
52
3.5.4.1 Validity and Reliability
The researcher wanted to know whether the instrument was good or not, so some criterias were considered. The criterias of a good instrument were validity
content validity and construct validity and reliability.
3.5.4.1.1 Content Validity
The content validity of the questionnaire was based on the objective of the research. The objective of the questionnaire was
to measure the students’ perception after the researcher gave the treatment using KWL Know, Want to
know, Learned and Jigsaw techniques. Then, it was clear that the questioannire was really needed to measure the perception of students on the implementation of
KWL Know, Want to know, Learned and Jigsaw techniques.
3.5.4.1.2 Construct Validity
The construct validity of the questionnaire was achieved by looking at the relationship among the indicators. The indicators measured the same aspect the
students’ perception, so it had positive association. Meanwhile, negative association was if the indicators measure different aspect.
3.5.4.1.3 Reliability
The reliability refers to the consistency of the test, and how the test can measure the same subject in different time but it has the same results Setiyadi, 2006:16.
In other words, the result of data are consistent in its score and give us an
