Instrument of the research

descriptive text in 60 minutes for time allocation. The topics that could be chosen by the students were: a. My Family b. Cat c. My House d. Computer In this research to evaluate the st udents’ writing score, the writer used analytic rating scale adapted from Christopher Tribble. The text assessed based on the aspect of writing assessment: content, organization, vocabulary, language, and mechanics. The total score of writing test is 100. Table 6 Scoring System Writing Aspect Score Description Task fulfillmentContent 20-17 Excellent to very good: treatment of the subject, considerable variety of ideas or argument; independent and through interpretation of the topic; content relevant to the topic; accurate detail. 16-12 Good to average : adequate treatment of topic, some variety of ideas or argument; some independence of interpretation of the topic; reasonably accurate detail. 11-8 Fair to poor : treatment of topic is hardly adequate, little variety of ideas or argument; some irrelevant content to the topic, lacking detail. 7-5 Very poor : inadequate treatment of topic, no variety of ideas or argument, content irrelevant, or very restricted; almost no useful detail. 4-0 Inadequate : fails to address to task qith any effectiveness. Organization 20-17 Excellent to very good : fluent expression, ideas clearly stated and supported; appropriately organized paragraphs or sections; logically sequenced coherence; connectives appropriately used cohesion. 16-12 Good to average : uneven expression, but main ideas stand out; paragraphing or section evident, logically sequenced coherence; connectives used cohesion. 11-18 Fair to poor : very uneven expression, ideas difficult to follow; paragraphing or organization does not to help the reader; logical sequenced difficult to follow coherence; connectives largely absent cohesion. 7-5 Very to poor: lack fluent expression, ideas very difficult to follow, little sense of paragraphing or organization; no sense of logical sequence difficult to follow coherence; connectives not used cohesion. 4-0 Inadequate : fail to address this aspect of the task with any effectiveness. Vocabulary 20-17 Excellent to very good: wide range of vocabulary; accurate work or idiom choice and usage; appropriate selection to match register. 16-12 Good to average : adequate range of vocabulary; occasional mistakes in word or idiom choice and usage; register not always appropriate. 11-8 Fair to poor : limited rang vocabulary; a noticeable number of mistakes in word or idiom choice and usage; register not always appropriate. 7-5 Very poor : no range of vocabulary; uncomfortably frequent mistakes in word or idiom choice and usage; no apparent sense of register. 4-0 Inadequate : fails to address his aspect of the task with any effectiveness. Language 30-24 Excellent to very good : confident handling to appropriate structures, hardly any errors of agreement, tenses, number, word order articles, pronouns, prepositions; meaning never obscured. 23-18 Good to average : acceptable grammar but problems with more complex structure; mostly appropriate structure; some error of agreement. Tense, number, word order, articles, pronouns, prepositions; meaning sometimes obscured. 17-10 Fair to poor : insufficient range of structures with control only shown in simple construction; frequent errors of agreement, tense, number, word order, articles, pronouns, prepositions; meaning sometimes obscured. 9-6 Very poor : major problems with structure even simple ones; frequent errors of negation, agreement, tense, number, word order function, articles, pronouns, prepositions; meaning often obscured. 5-0 Inadequate : fails to address this aspect of the task with any effectiveness. Mechanics 10-8 Excellent to very good : demonstrates full command of spelling, punctuation, capitalization, and layout. 7-5 Good to average : occasional errors in spelling, punctuation, capitalization, layout. 4-2 Fair to poor : frequent errors in spelling, punctuation, capitalization, and layout. 1-0 Very poor : fails to address this aspect of the task with any effectiveness. Source: Christopher Tribble, Language Teaching Writing New York: Oxford University Press, 1996 8 Final scores of writing test calculated with average. The formula is : 8 Christopher Tribble, Language Teaching Writing, New York: Oxford University Press, 1996, p.130 Final Score: Notes : R 1 : teachers’ rating score R 2 : researchers’ rating score

H. Try Out The test instrument of adjective mastery and writing descriptive text ability were tried

out before the instruments were used. This was intent to know the validity and reliability of the instrument. The writer measured the validity and reliability by trying out the instrument to 20 students from classes VIII.1 and VIII.3 that had been chosen as sample try out who were out of sample of this research.

I. Validity

According to Arikunto, validity is a measurement which shows the levels of validity or the real of the instrument. A valid instrument has a high validity. On the other hand, the instrument which lacks validity has a low validity. 9 In addition, Setiyadi states that generally validity is a measurement to show how far the measurement of something that must be measured. 10 It means the validity is measuring what to be measured. In this research, there are some aspects to be considered to measure validity of the test. 9 Suharsimi Arikunto, Op.Cit. p.211 10 Ag.Bambang Setiyadi, Metode Penelitian untuk Pengajaran Bahasa Asing Pendekatan Kuantitatif dan Kualitatif, Yogyakarta: Graha Ilmu,2006,p.22. 1. Content Validity Content validity shows whether or not the test has good reflection on the material to be tested. It refers to the instrument parallel with the matter that measured. This research is aimed to measure students’ mastery in using adjective and ability in writing descriptive text of the eighth grade students. The test have to measure the students’ mastery in using adjective and their ability in writing descriptive text based on curriculum and syllabus. 2. Construct Validity Construct validity shows whether the test is actually in line with the theories of what it is intended to know the language. In the research, the writer administered adjective and descriptive text writing tests. The writer consulted to the instrument to the English teacher to check and evaluate those items. 3. Internal Validity Point biserial correlation is one technique analysis correlation commonly in using to find correlation between two variables. The formula is as follows: Rpbi = √ Notes: Rpbi = coefficient of point biserial correlation Mp = the average score of all subject with true answer Mt = the total average St = the total score of standard deviation P = proportion subject with true answer q = proportion subject with false answer 11 An items is considered valid if the score of validity is higher than 0.444. It was based on the table of product moment where the r-critical for 20 subjects, df = N- nr = 20- 2= 18 with alpha 0.05 was 0.444. The result of validity analysis shows that there were 15 items considered invalid. They were 1,3,5,11,13,16,20,23,24,25,26,28,31,33,36, and 39 items number. Finally, the total valid items in try out were 25 items. see Appendix 13

J. Reliability of the Test

Arikunto says that reliability shows that instrument can be believed to be used as a tool of data collecting technique is good enough. 12 If the data are true based on the fact, no matter how many data are taken the result is same. Reliability shows the degree of mainstays about something. Reliability means the data can be delivered, so it can be relied on. To get reliability of using adjective, the writer used spearman Brown formula as 11 Anas Sudijono, Pengantar Statistik Pendidikan, Jakarta: Rajawali Press, 2014, p. 258 12 Suharsimi Arikunto,Op.Cit.,p.221

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