CHAPTER IV ANALYSIS AND INTERPRETATION OF DATA
2.2. Data Analysis
4.1.1. The Reliability of the Test
Wayan and Sumartana 1986:131 define that reliability is the extent to which a test produce consistent results when administered under similar conditions. To know the
reliability of the test, we should find the mean score and the standard deviation of the test.
X = N
X
SD = N
1 }
. {
2 2
X
X N
where, X = the mean score
SD = standar deviation
X
= the total of correct answer
2
X = the quadrate of the total score N
= the number of respondents
26
Universitas Sumatera Utara
So, Mean Score: X = N
X
= 30
2255
= 75,1 = 75 rounded
Standar Deviation SD: SD = N
1 }
. {
2 2
X
X N
= 30
1 }
2255 177465
. 30
{
2
= 30
1 5085025
5323950
= 30
1 238925
= 30
79 ,
488
= 16,2 = 16 rounded
Reliability of the test: r =
1
N N
2
1 NX
m N
m
= 1
30 30
2
16 30
75 30
75 1
= 29
30
7680
3375 1
27
Universitas Sumatera Utara
= 29
30
43 ,
1
= 1,03.0,57 = 0,58
= 0,6 rounded
From the calculation, it can be seen that the reliability of the test is significant, as Arikunto 2002:245 stated the standard of reliability is:
0,00 - 0,40 = the reliabiity is low 0,41 – 0,70 = the reliability is significant
0,71 – 0,90 = the reliability is high 0,91 – 1,00 = the reliability is very high
28
Universitas Sumatera Utara
Tabel 4.1
The calculation of X and X
2
NO Name X X
2
1 Andy Mustaqim
90 8100 2 Anggiat
S 63 3969
3 Arifin Sitorus
100 10000 4 Bayu
Sugara 93 8649
5 Benny Y. S
56 3136
6 David H
60 3600 7 Debi
Pranata 63 3969
8 Didi Fajar
76 5776 9 Doni
Putra D
46 2116 10 Feri
Irawan S
100 10000 11 Fisker
T 43
1849 12 Harianto
S 73
5329 13 Hasiholan
M 66
4356 14 Heryanto
H 86
7396 15 Ian
Deficson 76
5776 16 Iksan
Aiba 86
7396 17 Maniur
S 43
1849 18 Marihot
H 86
7396 19 Nur
Iswandi 66
4356 20 Peterson
93 8649
21 Rikki Fernando
56 3136
22 Riko Sipayung
46 2116
23 Rinaldi Sitinjak
56 3136
24 Roy Ferianto
100 10000 25 Sudarto
96 9216
26 Suharno 73
5329 27 Syahri
Ramadhan 96
9216 28 Syuyanto
93 8649
29 Winardi 70
4900 30 Yose
Rizal 90
8100
Total
X
=
2255
2
X
= 177465
29
Universitas Sumatera Utara
4.1.2. The Presentation Of The Data Analysis
Kategori