Validity Test Instrument Test
X = Average score ∑ �= Total score
N = Total Item Eko Putro Widyoko, 2011: 237
To improve total of score average for each aspect qualirarievly using following criteria on Table
Table 10 Criteria Assesment Category Score
Rentang Skor Value
Kategori 5
x ≤ �� + 1,8 ISD
A Strongly Feasible
4 �� + 0,6 ISD x ≤ �� + 1,8 ISD
B Feasible
3 �� - 0,6 ISD x ≤ �� + 0,6 ISD
C Neutral
2 �� - 1,8 ISD x ≤ �� -0,6 ISD
D Not Feasible
1 x
≤ �� - 1,8 ISD E
Strongly Not Feasible Sources: Eko Putro Widoyoko 2011: 236
Information: Maximal Score
= 5 Minimum Score
= 1 Maximum Ideal Score
= total indicators x the highest scores Minimum Ideal Score
= total indicators x the lowest scores X
= score that obtained ��
= ½ maxs ideal score + min ideal score ISD Ideal Standard Deviation = 16 maxs ideal score
– min ideal score
Eko Putro Widyoko, 2009: 238 Maximum Ideal score = 5
Minimum Ideal score =1 ��
= ½ 5+1 = 3 ISD
= 16 5-1 = 0,67
5- Scale = x
≤ �� + 1,8 ISD = x
≤ 3 + 1,8 x 0,67 =x
≤ 3 + 1,206 = x
≤ 4,206 4-Scale
= �� + 0,6 ISD x ≤ �� + 1,8 ISD
= 3 + 0,6 x 0,67 x ≤ 4,206
= 3 + 0,402 x ≤ 4,206
= 3,402 x ≤ 4,206
3-Scale =
�� - 0,6 ISD x ≤ �� + 0,6 ISD = 3- 0,402 x
≤ 3,402 = 2,598 x 3,402
2-Scale =
�� - 1,8 ISD x ≤ �� -0,6 ISD = 3- 1,87 x 0,67 x
≤ 3 – 0,6 x 0,67 = 3
– 1,206 x ≤ 2,598 1-Scale
= x ≤ �� - 1,8 ISD
= x ≤ 1,794
Based on above calculations, conversion of 5-scale quantitative data can be simplified as presented in following table.
Table 11 Guidelines for Conversation Quantitative Data to the Qualitative Data with 5-Scale
Value Score Interval
Criteria
A x4,206
Strongly Feasible B
3,402 x ≤4,206
Feasible C
2,598 x ≤3,402
Neutral D
1,794 x ≤2,598
Not Feasible E
x ≤ 1,794
Strongly Not Feasible