Theoretical framework The Disadvantage of Using Realia

research was experimental research. Because experimental research as the description and analysis of what or will occur, under carefully controlled condition. 3 In conducting this research, the writer used the quasi experimental design. Quasi-experimental design was applied because the writer was able to control at least one of most dominant variable of the research, 4 and he chose this design because the experimental design is used to determine influences an outcome or dependent variable. 5 This research used two groups as the object of the research; those were experimental class and controlled class. In this research, the experimental class received some treatment that is using realia in learning concrete nouns and controlled class did not. The quasi-experimental design was described in the following table. Table 3.1 Pre-test and Post-test Design Group Pre-test Treatment Post-test Experimental Q1 Learning concrete noun by using realia. Q2 Controlled Q1 Learning concrete noun without realia. Q2 Based on the table above, the writer took two classes, experimental class and controlled class. The writer gave the pre-test to both of experiment and controlled class before he gave the treatment. He taught the students in experimental class by using realia and in controlled class without using it. After four meeting, the writer gave the post-test to the both of students in experimental and controlled class. It was given to know 3 Yogesh Kumar Singh, Fundamental of Research Methodology and Statistic, New Delhi, New Age International Publisher, 2006, p. 134. 4 Nana Syaodih Sukmadinata, Metode Penelitian Pendidikan Bandung: PT Remaja Rosda Karya, 2012, p.220. 5 John W. Creswell, Educational Research: Planning, Conducting, and Evaluating Quantitative and Qualitative Research Fourth Edition, Boston: Pearson Education, 2002, p. 295. the influence of realia in teaching concrete nouns to the second grade students of MTs Masyariqul Anwar Caringin.

D. Research instrument

1. Pilot Study of the Instrument

The pilot study was held in order to check validity and reliability of the instrument. It was conducted before doing pre-test and post-test. There were 50 items in the pilot study of instrument which given to respondents to be answered. Each questions have four possible answers.

E. Trustworthy of the Study

1. Validity and Reliability of Instrument

As it has been told previously that the instrument used in this research is test. Before the instrument is given to the sample of the research, it has to be tasted to see the validity and reliability of the instrument. After conducting the pilot study, validity and reliability test is applied. Validity test is conducted to check whether the test measures what is needed to be measured. 6 Meanwhile reliability test is conducted to know how representative, how consistent, and how replicable the measurement. The writer made the instrument for pre-test which is consist of 50 number of questions in the type of multiple choice test. The test firstly being tested to 2.A students of MTs Masyariqul Anwar Caringin on April 4 th 2016. After being tested, the instruments were analysed by using ANATES software to see the validity and reliability if the test. The result showed that the reliability of the test is 0.82 which means that the reliability of the test is high. For the validity, it can be see the table from the result of the calculation of df with the formula df = n-2 and see the tables for the significant value of p=0.05. From the formula, it result that the df = 6 Arthur, Hughes, Testing for Language Teachers Second Edition, Cambridge: Cambridge University Press, 2003 p. 26.

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