Y: The total gained score of students in controlled class N: The total students in controlled class
3. Determining of deviation of experimental class =
4. Determining of deviation of controlled class =
5. Determining the t-test After gaining the main gained score and the deviation from each
class, the next step of calculation is determining the t-test, the formula from Arikuntois used as follow:
8
notes: = Mean of gained score of experiment class
= Mean of gained score of controlled class =The total gained score of students in the experimental class
= The total gained score of students in the controlled class = The total students in the experimental class
= The total students in the controlled class 6. To measure degree of freedom by df =
+ - 2
7. To check the criteria t-table with significance degree 5
8
Suharsimiarikunto, ProsedurPenelitianSuatuPendekatanPraktik, Jakarta: PT. Rineka Cipta,2006,p.312.
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CHAPTER IV RESEARCH FINDINGS AND DISCUSSIONS
This chapter presents the description of the data, the analysis of the data, the test of hypothesis and the interpretation of the data.
A. The Description of the Data
Since this research using experimental as the research method, the pre-test and the post-test are taken from the experiment and the controlled class. The
experiment class is XI IPA 1 which consists of 29 students and the controlled class is XI IPS 1 which consists of 29 students.
The test that was given to the students is making an effective essay which consists of five paragraphs. The five paragraphs consist of an introductory
paragraph, three body paragraphs, and one concluding or closing paragraph. The assessment used to assess the essay is from Jacob et al. scoring procedures. The
reason why Jacobs et al. scoring procedures used is because it is commonly used by the numerous college-level writing programs. The scoring procedure used is
an analytic scoring. “In the Jacobs et al. scale, scripts are rated on five aspects of writing: content, organization, vocabulary, language use, and mechanics. The
five aspects are differentially weighted to emphasize first content 30 points and next language use 25 points, with organization and vocabulary weighted
equally 20 points and mechanics receiving very little emphasis 5 points.”
1
Here is the table of scoring writing skill,
1
Sara Cushing Weigle, Assessing Writing. New York: Cambridge University Press, 2002, p.115.
