treatments were applied. Then the researcher gave the treatments inquiry-based learning strategy on students’ writing class of the experimental group VIII D.
As a comparison, the researcher applied communicative language teaching on students’ writing class of the control group VIII E. After that, the researcher
implemented the post-test to measure the result of students’ writing ability after the treatments were given. Then, the researcher compared the pre-test and post-
test mean scores of every group to find the improvement of students’ writing ability.
Both the experimental and control groups received the same pre-test and post-test to measure the students’ writing skills, but they received different
treatments. The experimental group used inquiry-based learning strategy on its writing class, whereas the control was used communicative language teaching on
its writing class. Table 7 presents the implementation of the research.
Table 7: The Schedule of the Research
No. Date
Activities Time
Materials
1. 13
th
February 2013 Pre-test of the
Experimental Class 70 mins
Writing test Pre-test of the
Control Class 70 mins
Writing test 2.
18
th
February 2013 1
st
meeting of the Control Class
80 mins Narrative text
3. 19
th
February 2013 1
st
meeting of the Experimental Class
80 mins Narrative text
4. 20
th
February 2013 2
nd
meeting of the Control Class
80 mins Narrative text
Continued
Continued
No Date
Activities Time
Materials
20
th
February 2013 2
nd
meeting of the Experimental Class
80 mins Narrative text
5. 25
th
February 2013 3
rd
meeting of the Control Class
80 mins Narrative text
6. 26
th
February 2013 3
rd
meeting of the Experimental Class
80 mins Narrative text
7. 27
th
February 2013 4
th
meeting of the Control Class
80 mins Narrative text
4
th
meeting of the Experimental Class
80 mins Narrative text
8. 4
th
March 2013 Post-test of the
Control Class 80 mins
Writing test 9.
5
th
March 2013 Post-test of the
Experimental Class 80 mins
Writing test
F. Data Analysis Technique
In this study the researcher used two techniques of analyzing the data, namely descriptive and inferential statistics.
1 Descriptive analysis
The descriptive analysis is utilized to describe and interpret the data. The statistics used in computation are the mean, which is the average score
attained by the subjects of the research, and Standard Deviation SD, which is the average variability of all scores around the mean.
Descriptive analysis is to provide answer to the research question formulated about whether there is a significant different in writing ability
between the students taught using inquiry activity and those taught without it.
Score Categorization
The categorization of scores gained by students is made to find out the level of students’ writing ability. The scores categorization of students’
writing ability is based on the ideal score. The highest score are 100 and the lowest score is 25. The ideal mean score Mi and ideal standard deviation
SDi can be calculating using the formula is as following: Ideal Mean Mi
: ½ highest score + lowest score : ½ 100 + 25
: 62.5 Ideal Standard Deviation SDi
: ⅓ highest score – ideal mean : ⅓ 100 – 62.5
: 12.5 To make the categorization of the score of students’ writing ability,
the ideal mean score Mi and the ideal standard deviation score SDi should be found first. The score of students’ writing ability can be a categorized into
six level, namely, excellent, very good, good, fair, poor, and very poor. The score is calculated based on the Mi score and SDi which can be seen in Table
8. Table 8: Score Categorization No
Interval Category
1. 87.5 up to 99,9
Excellent 2.
75.0 up to 87.4 Very Good
3. 62.5 up to 74.9
Good 4.
50.0 up to 62.4 Fair
5. 37.5 up to 49.9
Poor 6.
25.0 up to 37.4 Very Poor
2 Inferential statistics
The inferential statistics focused on answering the question, if there is significant difference in studentss’ writing ability between students who were
taught writing by inquiry activity. The inferential analyses used in this study are:
a Test of Normality
The normality test was used to see whether the distribution of responses to the instrument is normal or not. Therefore, the Kolmogorov-
Smirnov test is used in this study. Theoretically, if the value of p is greater than 0.05, the data is normal. If it is below 0.05, the data significantly deviate
from a normal distribution.
b Test of Homogeneity
A homogeneity test was used to analyze whether or not the sample variance is homogeneous. In this study, the Levene’s test is used. It is a
formal statistical test of the assumption of homogeneity of variances.
c Test of Hypothesis
The test of hypothesis was used to analyze whether or not there is any significant difference in terms of writing ability improvement between the
students used inquiry activity and those who are not. In this case, the researcher used Analysis of Covarians ANCOVA. According to Fraenkel
and Wallen 2006, it is used when, for example, there are groups who are given a pre-test related in some ways to the dependent variable and their
mean scores on this pre-test are found to differ. Moreover, ANCOVA enables
