C. Operational Definition of Variable
The operational of variables were as follows:
1. Independent Variable X
Magic wheel game was the technique of teaching English with circle containing the subject, verb, and object. The Magic Wheel game was also one
of game that can make students interesting in teaching learning process.
2. Dependent Variable Y
Students’ simple past tense mastery was the students’ ability to understand about simple past tense the material about nominal sentence, verbal sentence,
regular and irregular verb . It is indicated by students’ score of simple past tense
that was achievedfrom the test.
D. Population, Sample, and Sampling Technique 1. Population
The population is the whole subject that is studied in the research. It is supported by Sugiyono who states that population was all subject of the research.
6
So population of this research was all students at the first semester of the eighth grade
at MTs Negeri 2 Lampung Selatan in 20162017 academic year. The total numbers of population were 212 that consist of 6 classes.
6
Ibid
, p. 117.
Table 6 Population of TheResearch
Classes Classification
Total Male
Female
VIII.A 19
13 32
VIII.B 27
09 36
VIII.C 17
18 35
VIII.D 13
24 37
VIII.E 15
21 36
VIII.F 20
16 36
Total 111
101 212
Source: document of MTs Negeri 2 Lampung Selatan
2. Sample
Sample is part of population. According to Sugiyono “sample is part of the amount and characteristic which is owned by population.”
7
Sugiyono also states that a good sample is one that is representative of the population from which is
selected.
8
Based on two definitions above, it can be concluded that sample is the several of population that represents the population that will be studied. In this
research, researcher took two classes, one as the experimental class and the other one as control class. They are VIII D as a control class consisting of 37 students
and VIII E as an experimental class consisting of 36 students.
7
Ibid
, p. 118.
8
Ibid.
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