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three group of each category of test type that is upper, middle, and lower group. Therefore, student number 1 to student number 15 are categorized as the Upper
Group UG, student number 16 to student number 30 are categorized as the Middle Group MG and student number 31 to student number 45 are categorized
as the Lower Group LG. To do the analysis of difficulty level and discriminating power, the groups that used to be analyzed are the UG and the LG
only.
2. Analysis of the Data
The first step to do the difficulty analysis is listing the students’ responses of each number of the test. The list can be seen in the append
ices of this “skripsi” labeled table 4. The second step is to make the format of item analysis.
The technique of data analysis used in this researc h is quantitative. It’s
calculated the data by using simple percentage formula to measure the difficulty level and discriminating power of each test item and then analyzed the difficulty
level and discriminating power of each test item. This researched adopted this following formula to find out the difficulty level
and discriminating power of each item in the last Examinations English Summative Test for Junior High School Level academic year 2013-2014 by the
last E examinations’ English Summative tested at the first grade of students of
“SMP Islam Annur TanahAbang Jakarta Barat:
DL: The index of difficulty level U : The number of students in the upper group who answered the item correctly
L : The number of students in the lower group who answered the item correctly T : Total number of students in upper and lower group
DL= U + L T
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After calculating the difficulty of each test item, then the next step is to count the difficulty level of all items of each test type by using this formula:
1
P : Difficulty level of all items b : Difficulty level of each item
∑ : Sigma total N : Total number of test items
To know the categorized of each item of the test, the writer uses this formula:
Level of Difficulty
P Interpretation
≤ 0.30 Difficult
0.31 – 0.69
Moderate ≥ 0. 70
Easy
From the calculation the results of the analysis as follow:
1
Sumarna, Surapranata, Analisis, Validitas, Reliabilitas, dan Interpretasi Hasil Test, Bandung: Remaja Rosdakarya, 2006, p. 21.
P = ∑ b N
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Table 4.4 Format of Item Analysis of the English Summative Test Type P1
Item Number
Number of students who
answered item correctly
Upper Group
Number of students who
answered item correctly
Lower Group
TOTAL U + L
Difficulty Level
Interpretation
1 3
7 10
0,45 Moderate
2 9
7 16
0.72 Easy
3 5
3 8
0.36 Moderate
4 6
6 12
0.54 Moderate
5 6
4 10
0.45 Moderate
6 1
3 4
0.18 Difficult
7 7
3 10
0.45 Moderate
8 10
4 14
0.63 Moderate
9 10
10 20
0.90 Easy
10 1
3 4
0.18 Difficult
11 5
1 6
0.27 Difficult
12 6
1 7
0.31 Moderate
13 6
3 9
0.40 Moderate
14 1
4 5
0.22 Difficult
15 3
7 10
0.45 Moderate
16 2
6 8
0.36 Moderate
17 1
1 2
0.09 Difficult
18 4
9 13
0.59 Moderate
19 7
10 17
0.77 Easy
20 7
5 12
0.54 Moderate
41
Item Number
Number of students who
answered item correctly
Upper Group
Number of students who
answered item correctly
Lower Group
TOTAL U + L
Difficulty Level
Interpretation
21 4
2 6
0.27 Difficult
23 6
8 14
0.63 Moderate
24 2
3 5
0.22 Difficult
25 8
8 16
0.72 Easy
26 2
2 0.09
Difficult 27
7 9
16 0.72
Easy 28
4 5
9 0.40
Moderate 29
7 1
8 0.36
Moderate 30
15 5
20 0.90
Easy 31
4 1
5 0.22
Difficult 32
3 2
5 0.22
Difficult 33
4 4
0.18 Difficult
34 4
1 5
0.22 Difficult
35 2
2 4
0.18 Difficult
36 5
3 8
0.36 Moderate
37 5
3 8
0.36 Moderate
38 5
2 7
0.31 Moderate
39 3
1 4
0.18 Difficult
40 5
3 8
0.36 Moderate
41 3
3 0.13
Difficult 42
1 3
4 0.18
Difficult 43
2 1
3 0.13
Difficult
42
Item Number
Number of students who
answered item correctly
Upper Group
Number of students who
answered item correctly
Lower Group
TOTAL U + L
Difficulty Level
Interpretation
44 2
4 6
0.27 Difficult
45 4
4 8
0.36 Moderate
46 1
4 5
0.22 Difficult
47 3
3 0.13
Difficult 49
2 3
5 0.22
Difficult 50
2 2
4 0.18
Difficult
P = ∑b = 18,78 = 0.3756
N 50 MODERATE
Table 4.5 Format of Item Analysis of the English Summative Test Type P2
Item Number
Number of students who
answered item
correctly Upper
Group Number of
students who answered
item correctly Lower
Group TOTAL
U + L Difficulty
Level Interpretation
1 4
6 10
0.45 Moderate
2 2
3 5
0.22 Difficult
3 2
4 6
0.27 Difficult
43
Item Number
Number of students who
answered item
correctly Upper
Group Number of
students who answered
item correctly Lower
Group TOTAL
U + L Difficulty
Level Interpretation
4 2
5 7
0.31 Moderate
5 8
8 16
0.72 Easy
6 1
2 3
0.04 Difficult
7 3
4 7
0.31 Moderate
8 2
2 4
0.18 Difficult
9 8
11 19
0.86 Easy
10 2
2 4
0.18 Difficult
11 1
1 2
0.09 Difficult
13 3
1 4
0.18 Difficult
14 1
1 2
0.09 Difficult
15 1
6 7
0.31 Moderate
16 5
3 8
0.36 Moderate
17 3
3 0.13
Difficult 18
2 2
0.09 Difficult
19 8
8 16
0.72 Easy
20 4
4 8
0.36 Moderate
21 9
5 14
0.63 Moderate
22 8
5 13
0.59 Moderate
23 6
1 7
0.31 Moderate
24 3
1 4
0.18 Difficult
25 9
5 14
0.63 Moderate
