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Data Collecting Technique METHODS

Validity for the test can be identified by using this formula: r = √ r = coefficient of point biserial correlation M p = the average score of each items M t = the average score from the total score Sd t = standard deviation of the total score p = a number of students with correct answer q = a number of students with wrong answer Both content and construct validity had been tested using inter rater validity by asking seven students of English Education Study Program. Most of them stated that the tests were acceptable to measure students vocabulary achievement. b. Reliability Reliability is consistency of the test. Heaton 1991 stated that reliability denotes the extend to which the same marks or grades are awarded if the same test papers are marked by i two or more different examiners or ii the same examiner on different occasions. In short, in order to be reliable a test must be consistent in its measurement. Reliability for the whole test can be found by using this formula. Where N = the number of items in the test m = the mean score of the test for all the testees x = the standard deviation of all the testees’ scores r = reliability Heaton:1991 The criteria of reliability: High : 0,90 – 1,00 Moderate : 0,50 – 0,89 Low : 0,00 – 0,49 After analyzing the result of pre-test and post test of vocabulary from both classes using SPSS 16.0, the researcher found that cronbach’s alfa of the test was 0.457. It meant the reliability of the test was still low. This was the table of the analysis. Table 3. Reliability of the test Case Processing Summary N Cases Valid 63 100.0 Excluded a .0 Total 63 100.0 a. Listwise deletion based on all variables in the procedure. Reliability Statistics Cronbachs Alpha N of Items .457 2

3.6. Procedure

The procedure of this research was explained as follow: 1. Constructing instrument for pre-test and post test and materials for teaching. 2. Selecting the population and samples of the research. The population used in this research were the students in the second grade of SMAN 1 Kalirejo and the sample were class XI IPS 1 and class XI IPS 2. 3. Trying out the instrument test of vocabulary, the try out test was done in class XI IPS 3. 4. Giving a pre-test for students in order to identify the level of vocabulary achievement. 5. Conducting a treatment. The reasercher taught vocabulary for the subject of the research using these two technique. One class used clustering technique and one another used derivational exercises. 6. After giving a treatment, the students were given a post test to identify whether the techniques give an improvement for students’ vocabulary achievement. 7. The last, after getting all the data, the researcher analyzed the data by using SPSS to know the result.

3.7. Data Treatment

After collecting the data, the researcher analyzed the data by using Independent Group T-Test in SPSS Statistical Program for Social Science. The researcher collected the data by looking at the result of pre-test and post test of

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