: Mean of variable X : Mean of variable Y
�
−
: Standard error mean of difference mean of variable X and mean of variable Y
9. Determining t-table in significant level 5 and 1 with df. df =
+ −
df: degree of freedom N1: number of students controlled class
N2: number of students experimental class
2
F. Statistical Hypothesis
The Statistical hypotheses of this research can be seen as: 1.
� = μ
1
= μ
2
: Crossword puzzle game is not effective on students’
vocabulary mastery for the second grade students of SMP Puspita Bangsa Ciputat.
2. �
�
= μ
1
≠ μ
2
: Crossword puzzle game is not effective on students’
vocabulary mastery for the second grade students of SMP Puspita Bangsa Ciputat.
And then the criteria used as follows: 1. If –test t
t-table t
t
in significant degree or α alpha of 0.01 H null
hypothesis is rejected. It means that the rates of mean score of the experimental class are higher than the controlled class. The using of
crossword puzzle game is effective on students’ vocabulary mastery. 2. If –test t
t-table t
t
in significant degr ee or α alpha of 0.01 H
null hypothesis is accepted. It means that the rates of mean score of the
experimental class are same or lower than the controlled class. The using of crossword puzzle game is effective on students’ vocabulary mastery.
2
Anas Sudijono, Pengantar Statistik Pendidikan, Jakarta: PT Raja Grafindo Persada, 2006, pp. 315-316.
CHAPTER IV RESEARCH FINDING AND INTERPRETATION
A. Research Finding 1. Data Description
To know the result of the tests pre-test and post-test, the writer displayed the table of students score from both classes the experimental class and the
control class. There were 40 items of question on the test; score for whole items were 100. The form of the test and the key answer can be seen in
appendix.
Table 4.1 The Test Result of Experimental Class
by using Crossword Puzzle Game Students
Experimental Class Gained Score
Pre Test Post Test
1 50
60 10
2 70
75 5
3 50
75 25
4 55
85 30
5 45
80 35
6 45
60 15
7 35
30 -5
8 75
85 10
9 70
85 15
10 55
80 25
11 60
60 12
60 70
10 13
70 80
10 14
55 70
15 15
65 75
10 16
40 80
40 17
50 60
10 18
55 85
30 19
30 60
30 20
55 80
25 21
75 95
20 22
55 60
5