Scale used in this instrument is Likert Scale. It is scale used to measure attitude, opinion and perception of a person or a group of social
phenomenon Sugiyono, 2012: 93. Gradation answer any instrument used a Likert scale from very positive to very negative with scores as
follows:
Table 9. Measurement Scale of identity Style Positive Questions
Negative Questions Answers
Score Answers
Score
Strongly Agree 4
Strongly Agree 1
Agree 3
Agree 2
Disagree 2
Disagree 3
Strongly Disagree 1
Strongly Disagree 4
J. Instrument Test
Test of instrument is very important step in process of developing instrument, because this test is used to know information of instrument quality
that developed Sumadi Suryabrata, 2012: 55-56. Instrument test in this research is only carried out on pretest, posttest and questionnaire. Instrument
test is done in grade X Accounting II SMK Negeri 1 Wonosobo because this class also has similar characteristics with grade X 1 and X Accounting
Accounting III. Instrument test in this research are as follows:
1. Validity Test of Instruments
Validity indicates ability of an instrument measurement tool measures what should be measured Uhar Suharsaputra, 2014: 98. The
validity in this research was conducted in grade X Accounting II. To look for the validity, the reasearcher performed uses Pearson Product Moment
method which uses SPSS 19.00 for Windows. Validation criteria to
determine the validity test can be seen on row Asymp. Sig 2-tailed. If the data is less than significant level 5 so the data is valid, whereas if the
data is more than significant level 5 so the data is not valid. Based on the test, gained validity result of questionnaire are as
follows: a.
Informational Style Based on the indicators of Informational Style with the total are
11 statements, gained the result that 8 items are valid, and 3 items are not valid, there are items number 8, 9 and 11.
b. Normative Style
Based on the indicators of Normative Style with the total are 9 statements, gained results that 8 statements are valid, and 1 statement
is not valid, there are item number 17. c.
Diffuse-Avoidant Style Based on the indicators of Informational Style with the total 10
statements, gained result that 8 statements are valid, and 2 statements are notvalid, there are item number 29 and 30.
Based on the test can arranged the table are as follows:
Table 10. Summary of Identity Style ’s Validity Result
Identity Style Total of
Instrument Item
Total of Valid
Item Total of
Invalid Item
Number of Invalid
Item
Informational Style 11
8 3
8, 9, 11 Normative Style
9 8
1 17
Diffuse-Avoidant Style 10
8 2
29, 30 Source: Primary Data are Processed
While the validity results of achievement tests showed that of 15 items, there are 11 items are valid and 4 items are not valid, there are items
number 7, 10, 12 and 14. Based on the test can be arranged the table are as follows:
Table 11. Summary of Achievement Test ’ Validity Result
Total of Item
Number Total of
Valid Item Total of
Invalid Item
Number of Invalid
Items
Achievement Test
15 11
4 7, 10, 12 14
Source: Primary Data are Processed
2. Reliability Test of Instruments
