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Population and Sample of the Research Research Procedures

researcher arranged the instrument related to which is content words because content words can cover the material. The material is vocabulary of occupation, contain: noun, verb, adjective, and adverb. The content of pre test and post test were presented in the table specification below: Table 2. Table Specification of Pre test Table of specification of pre test No. Content Words Number of Items Percentage Item Numbers 1 Noun 11 27.5 4, 8, 10, 12, 13, 16, 17, 18, 24, 37, 40 2 Verb 7 17.5 1, 3, 9, 28, 30, 31, 38 3 Adverb 11 27.5 6, 7, 11, 14, 20, 21, 22, 32, 33, 34, 39 4 Adjective 11 27.5 2, 5, 15, 19, 23, 25, 26, 27, 29, 35, 36 Total 40 100 Table 3. Table Specification of Post test Table of specification of pre test No. Content Words Number of Items Percentage Item Numbers 1 Noun 11 27.5 2, 6, 8, 11, 13, 17, 24, 28, 35, 38, 40 2 Verb 7 17.5 3, 5, 16, 21, 23, 26, 36 3 Adverb 11 27.5 7, 9, 12, 14, 19, 27, 29, 30, 31, 32, 39 4 Adjective 11 27.5 1, 4, 10, 15, 18, 20, 22, 25, 33, 34, 37 Total 40 100

3.6.1.2 Construct validity

According to Setiyadi 2006: 26 if the instrument just measures one aspect, for example vocabulary, the construct validity can be measured by evaluating all items in the test. If all items have measured vocabulary mastery, this instrument would have fulfilled construct validity.

3.6.2 Reliability of The Test

Reliability is a necessary characteristic of any good test: for it to be valid at all, the test must first be reliable as a measuring instrument Heaton, 1975: 162. Reliability is a consistency of a measurement or how far that measurement can be measured the similar subjects in different time but showed the same result Setiyadi, 2006: 16. Knowing the reliability of the half of the test, Arikunto’s formula was used to get the result of the computation of try out test. After the researcher had obtained the reliability of half of its test, the researcher used Spearman Browns Prophecy formula to determine the reliability of the whole test Hatch and Farhady, 1982:246. Where : r : coefficient of reliability between odd numbers and even numbers items x : total numbers of odd numbers items y : total numbers of even numbers items            2 2 2 2            Y Y n X X n Y X XY n rxy

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