collecting the qualitative data is purposed to refine or elaborate the findings through in-depth qualitative exploration.
2
To get the deep information, the researcher needed to determine what aspect of the quantitative result to follow up on. In this case, the researcher needed to know
what learners’ perceive about the use of pictures in learning comparative adjectives, whether the pictures are motivating, interesting, encouraging,
contextual, practical, understandable, enjoyable, too complex, or ineffective teaching aid for learners in learning the comparative adjectives.
C. Population and Sample
1. Population
The population in this research was learners of second grade of Madrasah Tsanawiyah MTs Al- Islamiyah Ciledug Tangerang academic year 20132014.
There were 181 students of the second grade which are divided into five classes. 2.
Sample
In this research, the researcher took a sample because the population consists of five classes. The sample was randomly assigned as respondents for collecting
quantitative data. Random sampling is a sampling that chooses the population of a research randomly because it has same probability.
3
Prior to the assignment, the population was pre- tested in order to know whether they had the same
background or not. Then, the researcher chose 1 one class of learners randomly because she used pre-experimental design which only needed one group of sample
to be given a treatment.
4
The pre-experimental design was chosen for this research because the researcher intended to conduct the research deeply. She did not only
investigate the effect of the use of pictures in learning comparative adjectives to leaners’ score, but also she intended to investigate the learners’ perception of
using picture in learning comparative adjectives. Hence, the researcher recognized that using one class of learners as respondents of collecting quantitative data was
enough.
2
John W. Creswell, op.cit, p. 543
3
Sukardi, Metodologi Penelitian Pendidikan, Jakarta: Bumi Aksara, 2008, p. 58
4
Ibid., p. 184
The selected respondent for this research was 8-1 class which consisted of 37 learners. Then, the respondents were given post- test to measure their achievement
after they were given a treatment, teaching comparative adjectives by using pictures.
Further, for gathering qualitative data, knowing learners’ perception of the use
of pictures in learning comparative adjectives, the researcher selected the respondents based on their gained score pre- test and post- test. The researcher
used clustering sampling in determining the respondents of qualitative data collection by grouping them based on the gained score. The researcher selected
this sampling because she intended to investigate learners’ perception of the use
of pictures in learning comparative adjectives from all level of gained score. The respondents might perceive the using pictures in learning comparative adjectives
positively or negatively. Six learners who selected came from three categories of gained score- high, medium, and low. It meant that from each category of gained
score, the researcher selected two learners to be respondents in gathering qualitative data.
D. Research Instrument
In this research, the researcher used two research instruments. Firstly, for gathering the quantitative data, the researcher used test as the research instrument.
Moreover, for gathering the qualitative data, the researcher interviewed the respondents.
1. Test
In collecting the quantitative data, the research instrument which was used in this research was a test which was developed by the researcher. The tests which
were used in this research were pre-test and post-test. Further, the material of the test was taken from learners hand book and other book about comparative
adjectives. The type of test was multiple- choice which consisted of 30 items from number
1 to number 30. The score per item was 10. It meant that if the respondents could
