Planning Phase Acting Phase

23 used to know about the implementation of Clustering technique. Thus, in vocabulary material, the writer observed their vocabulary aspect, such as: words meaning, spelling, pronunciation, level of usage.

2. Interview

One of the ways to get deep information in the classroom is by interviewing the English teacher and the students. The unstructured and structured interview is conducted by the writer for this research. The structured interview conducted by using interview guide and it was conducted before and after implementing the classroom action research. The interview was about the English teaching learning process at SMP Al-Kautsar BKUI Jakarta. Primarily, about English teaching learning process, especially in vocabulary mastery.

3. Test

The test was used to find out the result of students’ achievement in learning vocabulary by using Clustering technique and it is as main Technique in collecting the data. The test was used to compare students’ English vocabulary mastery before conducting the research and after conducting the research.

I. The Technique of Data Analysis

The writer took the average of students’ vocabulary score to analysis the quantitative data in one cycle. It is used to measure how well students’ ability on vocabulary. It uses the formula as below: 6 X : mean x : individual score n : number of students 6 Anas Sudijono, Pengantar Statistik Pendidikan, Jakarta, Raja Grafindo Persada, 2008, p. 80. 24 Next, the writer tried to get the class percentage which pass the minimal mastery level criterion KKM considering English subject gains score 70 seventy. The formula is: 7 P : the class percentage f : total percentage score N : number of students After getting mean of s tudents’ score per actions, the writer analyzed whether there are any improvement of students’ vocabulary score from pre-test up to students’ average score in cycle 1 and cycle 2 or not. In analyzing that, the writer used the formula: P : percentage of students’ improvement y : pre-test result y1 : post-test 1 P : percentage of students’ improvement y : pre-test result y2 : post-test 2 7 Ibid., p. 43.

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