Senior High School in Indonesia has implemented this curriculum as the main guideline of educational system this study included the sample of words from the
2004 CBC word list. Second, the vocabulary item in the “checklist” was the example of words in the 1
st
2000 thousand words of English taken from Nation 2002: 54-57.
C. Pilot Testing
Pilot study was done to find out whether this study is feasible and whether it is worthwhile to continue. Previously, the study proposed 53 derived words
constructing the test. Six respondents were chosen as the pilot project of this study 2 respondents of each class in Senior High School students. The result of the pilot
testing indicated that there were significant differences between the first, second and third year students in their syntactic recognition of derivational suffixes of English
words. Through some steps of corrections, it was found that the checklist contained
three words which came from conversion control, study, work. This study was only focused to the investigation on English derivational suffixes. Therefore, those three
words were excluded from the list. Automatically, the maximum score of this checklist test was 50.
On the other hand, Hopkins 1976: 99 argued that the most important property of any measuring instrument is the validity. In order to have content validity
the researcher provided the matrix of the checklist test that was used in the study. Table 3.2 presented the complete matrix of the test.
Matrix of Test Items Suffixes
Changes Lexical Categories Number of Items
-able -ive
-ful -ian
-ic -less
-ous -ate
-en -ize
2
-ize -attion
-er -ment
-ity -ness
-ly Verb
→ Adjective Verb
→ Adjective Noun
→ Adjective Noun
→ Adjective Noun
→ Adjective Noun
→ Adjective Noun
→ Adjective Adjective
→ Verb Adjective
→ Verb Adjective
→ Verb Noun
→ Verb Verb
→ Noun Verb
→ Noun Verb
→ Noun Adjective
→ Noun Adjective
→ Noun Adjective
→ Adverb 3 items
3 items 3 items
4 items 4 items
3 items 3 items
3 items 3 items
2 items 3 items
3 items 2 items
3 items 3 items
2 items 3 items
Table 3.2: Matrix of Test Items Hughes 1989:26 says that a testing technique was said to have construct
validity if it could be demonstrated that it measured just the ability which it was supposed to measure. In order to get the construct validity of the instrument, the
researcher consulted the checklist test to the supervisor of this study. The reliability of the checklist test was calculated by means of the Guttmann
Split-Half method presented in SPSS 11.0 for windows. The range of reliability coefficient is from o to 1. From the calculation it was found that reliability
coefficient r
xx
was 0,7341. This coefficient reliability was approaching +1. Hence, it could be considered that this checklist test was reliable.
D. Main Study
