d Decided the total of students become: 27 Upper and lower group students because the writer used large groups more than 40 students.
5
The writer took 27 from the upper group
25 students’ answer sheet and 27 from the lower group
25 students’ answer sheet from 92 students’ answer sheet so the upper group is taken from number 1 till 25 and lower group from number 68
till 92. e Analyzing the test based on the difficulty level and discriminating power
f Categorized and concluded the result of that analysis of the English Summative Test for first grade students at SMPN 3 Tangerang Selatan
20132014 academic year
To calculate the level of difficulty and the discriminating power, it can use the formula as follows:
6
5
Loc. cit.
6
J.B. Heaton , loc. cit.
FV =
or FV =
D =
Level of difficulty for each item must be interpreted in the rank scale of the difficulty level, as follow:
Table 3.1 The rank scale of Level of Difficulty
7
P Interpretation
0.30 Difficult
0.30
– 0.70
Moderate 0.70
Easy
Table 3.2 The classifications of the index of Discriminating Power D are:
8
Index of Discriminating Power
Classifications
0.70 – 1.00
Excellent 0.40
– 0.70 Good
0.20 – 0.40
Satisfactory ≤ 0.20
Poor Negative value on D
Very poor
7
Suharsimi Arikunto, Dasar-dasar Evaluasi Pendidikan, Jakarta: PT. Bumi Aksara, 2006, p. 210.
8
Anas Sudijono, Pengantar Evaluasi Pendidikan, Jakarta: PT. Raja Grafindo Persada, 2006 p. 389.
34
CHAPTER IV RESEARCH FINDINGS
A. Data Description
In this research, the writer used the English summative test of the first grade students of SMPN 3 Tangerang Selatan at odd semester 20132014 academic year
and the students’ answer sheets as the data sources. The total numbers of the test items are 45 items those are 40 multiple-choice items and 5 short items.
The writer used 92 students ’ answer sheet then she divided into three groups
which are upper, middle, and lower groups but the writer only used the upper and the lower group to analyze the data. To get these groups the writer divided 27 of 92
students ’ answer sheets. They are 27 25 students from upper group and 27 25
students from lower group. Based on the data in the appendix of the table 4.1, the score in the upper
group is begun from the highest score that is 95.5 till the lowest score of this group that is 85.5 which have the total of 25 students of this group from number 1 to 25
then the lower group is begun from the highest score of this group that is 58.5 till the lowest score that is 31.5 which have the total of 25 students this group from number
68 to 92 and the rest group is the middle group is begun from the highest score of this group that is 85.5 till the lowest score of this group that is 60 which have the total of
42 students of this group from number 26 to 67.
B. Data Analysis
After divided the data into three groups the writer only used the upper and lower groups to analyze the difficulty level and the discriminating power of each item
by using Anates Program and manual counting. Then, she found the difficulty level and the discriminating power for whole items.
First of all, the writer calculated the difficulty level and the discriminating power by using the Anates Program then she matched the result by using manual
counting based on the formula. The way of calculating the difficulty level is the amount of the correct answers of the upper group are added by the correct answers of
the lower group then divided with the amount of the students. Then, from the result can be interpreted based on the classification whether the range less than 0.30 it is
concluded in easy level, the range 0.30 to 0.70 as moderate level, or the range more than 0.70 it is included in difficult level.
The way of calculating the discriminating power is the amount of the correct answers of the upper group are lessened with the correct answers of the lower group
then divided with a half of the amount of the students. Then, from the result can be interpreted based on the classification whether it is included in excellent with the
range 0.70 to 1.00, good with the range 0.40 to 0.70, satisfactory with the range 0.20 to 0.40, poor with the range less than 0.20, or very poor negative value on
discriminating power. The results of the each item, the writer combined two classification of each
item whether the item is included in easy level and poor quality or difficult level and good quality. To make clear, the writer made the description of the analysis of each
item based on the appendix of the table 4.2 which is conducted by the writer that she found ten classifications of the test items:
1. There are 6 items which are included in easy level and satisfactory quality, those are items number 1, 9, 11, 25, 39, and 43.
There are the differences of index of each item in this level but still included in the same range that is more than 0.70 as easy level in term difficulty level
and the range 0.20 to 0.40 as satisfactory quality in term discriminating power.
2. There are 9 items which are included in easy level and poor quality, those are items number 2, 5, 6, 7, 8, 10, 15, 17, and 44.
There are the differences of index of each item in this level but still included in the same range that is more than 0.70 as easy level in term difficulty level
and the range less than 0.20 as poor quality in term discriminating power. 3. There are 8 items which are included in easy level and good quality, those are
items number 3, 14, 20, 22, 23, 27, 29, and 36. There are the differences of index of each item in this level but still included
in the same range that is more than 0.70 as easy level in term difficulty level and the range 0.40 to 0.70 as good quality in term discriminating power.
4. There are 5 items which are included in moderate level and poor quality, those are items number 4, 12, 16, 33, and 35.
There are the differences of index of each item in this level but still included in the same range that is 0.30 to 0.70 as moderate level in term difficulty level
and the range less than 0.20 as poor quality in term discriminating power. 5. There are 4 items which are included in moderate level and excellent quality,
those are items number 13, 41, 42, and 45. There are the differences of index of each item in this level but still included
in the same range that is 0.30 to 0.70 as moderate level in term difficulty level and the range 0.70 to 1.00 as excellent quality in term discriminating power.
6. There are 3 items which are included in difficult level and poor quality, those are items number 18, 30, and 32.
There are the differences of index of each item in this level but still included in the same range that is less than 0.30 as difficult level in term difficulty level
and the range less than 0.20 as poor quality in term discriminating power . 7. There are 6 items which are included in moderate level and good quality,
those items are 19, 21, 24, 26, 28, and 40. There are the differences of index of each item in this level but still included
in the same range that is 0.30 to 0.70 as moderate level in term difficulty level and the range 0.40 to 0.70 as good quality in term discriminating power.
