Mean was become the sample, XI MIA 2 and XI MIA 3. In which mean score of XI MIA 2 was 53.71 and mean score of XI MIA 3 was 55.09. So, XI MIA 2 was
an experiment class using Know Want Learn Plus Strategy and XI MIA 3 was an controlled class using Jigsaw in teaching analytical exposition.
The strategy used in this quantitative research was purposive sampling. Purposive sampling permitted the researcher to assume that she can used their
knowledge of the population to judge whether or not a particular sample will be representative.
D. Technique of Data Collecting
The technique of data collecting in this research was quantitative. Design of this research is quasi-experimental research. Meanwhile, the design of this
research was experiment. The instrument was test. The test consisted of pre-test and post-test. The pre-test provided a measure on some attribute or characteristic
that assess for participant in an experiment before they received a treatment.
1
The pre-test consisted of 25 question items in two different classes, an experiment and
controlled class. Meanwhile, the post-test was a measure on some attribute or characteristic that is assessed for participants in an experiment after a treatment.
2
The post-test consisted of 25 question items was given either in experiment class or controlled class. From these data the writer analyzed and obtained the result of the
research.
E. Technique of Data Analysis
To compare the differences between students score in using Know Want Learn Plus in teaching reading of exposition texts and using Jigsaw in teaching
reading of exposition texts, the writer used t-test.
1
John W. Creswell, Educational Research: Planning, Conducting, and Evaluating Quantitative and Qualitative Research, Third Edition, New Jersey: Pearson Education, 2008, p.
301.
2
Ibid.
The formula of t-test is expressed as follow:
3
M1 : Mean of difference of Variable X Experiment Class
M2 : Mean of difference of Variable Y Controlled Class
SEM1 : Standard Error of Variable X Experiment Class SEM2 : Standard Error of Variable Y Controlled Class
Before doing the calculation of t-test, there are several steps to be taken, the steps are:
4
a. Determining Mean of Variable X Variable 1
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b. Determining Mean of Variable Y Variable 2
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c. Determining Standard Deviation of Variable X score
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d. Determining Standard of Deviation of Variable Y score
3
Anas Sudiyono, Pengantar Statistik Pendidikan, Jakarta: RajaGrafindo Persada, 2011, pp. 346-348.
4
Ibid.
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