43
SEM
Y
= Standard Error mean of controlled class SD
Y
= Standard Deviation of controlled class N
Y
= Number of Students of controlled class 7
Determining standard Error of Difference of Mean of Variable X and Variable Y, with formula:
SE
MX-MY
= SE
MX 2
= Standard error mean squared of experiment class SE
MY 2
= Standard error mean squared of controlled class 8
Determining tₒ with formula: t
o
= 9
Determining t-table in significance level 5 and 1 with degree of freedom df :
df = N1 + N2 – 2
df = Degree of freedom N1= Number of students of Experiment class
N2= Number of students of controlled class
F. The Statistical Hypotheses
A hypothesis is a tentative statement about the relationship between two or more variables. This research is designed to find out whether there is a significant
progress of cooperative learning specifically using jigsaw in teaching the vocabulary of verbs. In order to get the answer of that hypothesis, the writer
proposed Alternative Hypothesis H
a
and the Null Hypothesis H which is
described to the following statistical hypothesis: a
If t
test
t
o
t-
table
t
t
in significant degree of 0,05, the alternative hypothesis Ha is accepted and the null hypothesis H
is rejected b
If t
test
t
o
t-
table
t
t
in significant degree of 0,05, the alternative hypothesis Ha is rejected and the null H
is accepted. Meanwhile, the degree of freedom df = N1+N2-2 = 34+34-2 = 66. It
must be consulted with t-table of df. If df is 66, the value of the significance level 5 is 1,99.
44
CHAPTER IV
RESEARCH
FINDINGS
A. The Description of Data
This research was done in two classes, the experiment class was VIII-D and the controlled class was VIII-C. The writer employed cooperative learning
especially using Jigsaw technique in experiment class and without using cooperative learning in controlled class.
This writer started the research by giving the same pre-test in experiment class and also in controlled class. The research was also followed by the teaching
and learning activities for four meetings which were conducted in each class. Afterwards, the post-test was given to both experiment class and also controlled
class. The form test of pre-test and post-test were multiple choice item and it was consists of thirty 30 questions. The pre-test and post-test should be done by the
students in forty-five 45 minutes in both of the two classes. After getting the post-
test‟s result, the writer made a calculation from both of the tests. Below is the more detailed description about the pre-test score, post-
test score and the gained score.
1. Pre-test Score
The writer has calculated the result of pre-test scores in both of the two classes and the description of pre-test scores of experiment class and controlled class will
be explained in table 4.1. The table consists of three columns; the first column showed the students‟ identification number. It means the amount of students‟
identification number in both experiment and controlled class is 68 students and each of the class has 34 students. The second column showed the pre-test students
in experiment class, while the third column showed the pre-test scores of students in controlled class.
