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Data Collection Technique RESEARCH METHOD

digilib.uinsby.ac.id digilib.uinsby.ac.id digilib.uinsby.ac.id digilib.uinsby.ac.id digilib.uinsby.ac.id digilib.uinsby.ac.id digilib.uinsby.ac.id questionnaire with different scale but they have same statements about vocabulary learning strategies. After deciding the scale of the instrument, then it is important to construct validity and reliability of the instrument. Firstly, the researcher constructed validity using construct validity approach. The approach of construct validity is having subject matter experts to examine the instrument whether it measures the objectives of the study. 10 Therefore, researcher asked for help from one of English teacher education department lecturer to validate the questionnaire whether it measures what supposed to be measured on this study. Secondly, the researcher did internal-consistency measures of reliability as the procedure to establish reliability of the instrument. The aim of measuring reliability is to measure the degree of consistency of the instrument and it measures whatever it is measuring. 11 One of the ways to establish reliability is measuring coefficient Alpha or Cronbach Alpha. Cronbach ’s Alpha measures the internal-consistency reliability between individual items with another items. 12 Therefore, Cronbach ’s Alpha indicates the consistency of the items. The range of Cronbach’s Alpha reliability co-efficient is between 0 and 1. Cronbach’s Alpha co-efficient that is close to 1,00 indicates the internal consistency of the items is good. 10 D. Ary, L. C. Jacobs - C. K. Sorensen, Introduction to Research … 235 11 D. Ary, L. C. Jacobs - C. K. Sorensen, Introduction to Research … 236 12 D. Ary, L. C. Jacobs - C. K. Sorensen, Introduction to Research … 639 digilib.uinsby.ac.id digilib.uinsby.ac.id digilib.uinsby.ac.id digilib.uinsby.ac.id digilib.uinsby.ac.id digilib.uinsby.ac.id digilib.uinsby.ac.id In order to establish reliability, researcher did pilot study on January, 2016. On the pilot study, questionnaire was administrated to 15 people of English teacher education department who have taken internship program academy year 2014-2015. After distributing 15 questionnaire to the respondent, then the data were organized see appendix 3 and calculated using following formula: 13 where K = number of items on the test ∑ � 2 = sum of variances of the item scores � 2 = variance of the test scores All K items The calculation of Alpha was done using SPSS Program. On the table 3.3 shows that the alpha of questionnaire I is 0,902 and the alpha of questionnaire II is 0,908. Based on George and Mollory as cited in Anil Matkar, alpha α that is 0,90 is having very good internal consistency between individual items. 14 Therefore, questionnaire items of this study have very good internal consistency reliability between individual items with another items. Table 3.3 Instrument Reliability Instruments Number of Questions Pilot Study α Questionnaire I 30 0,902 Questionnaire II 30 0,908 13 D. Ary, L. C. Jacobs - C. K. Sorensen, Introduction to Research … 246 14 A. Matkar, “Cronbach’s Alpha Reliability Co-efficient for standard of customer services in Maharashtra State Co-operative Bank ”. Abhinav Journal. Vol. 1 No. 3 , Merch 2012, 74

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