Degree of freedom df = N
1
+N
2
-2 =35+35-2
= 70-2 = 68
So, t-table value is = t
5=
2.00 t
1=
2.65 If
t
o
t
5
= Significant t
o
t
1
=Very Significant t
o
≤ t
5
=No Significant The result of computing the t-test shows t-observed 12.80 is higher than t-
table at the level significant 0.05 2.00 and also t-observed 12.80 is higher than t- table at the level significant 0.01 2.65. From the result of t-test above it can be
concluded that in the hypothesis, there is a very significant effect of using word square method in learning vocabulary for Junior High School. It means that H
is rejected and H
a
is accepted; there is a significant effect of using word square method to the students’ achievement in mastering vocabulary.
4.3.1 Testing Hypothesis by using SPSS
In this section, the researcher is using SPSS to analyze data statistically. To analyze data, the researcher uses Paired Sample T-Test to test whether there is an
effect of treatment on a group before and after the treatment. Paired Sample T-Test can be done as follow:
Click: Analyze → Compare Means → T-Test → Paired Sample T-Test
For alpha value, the researcher choose alpha value 5 0.05 and 1 0.01
Universitas Sumatera Utara
T-TEST PAIRS=pretest WITH posttest PAIRED CRITERIA=CI.9500
MISSING=ANALYSIS.
Table 4.9 T-Test
Notes
Output Created 13-JUN-2014 16:46:51
Comments
Input Active Dataset
DataSet0 Filter
none Weight
none Split File
none N of Rows in Working Data
File 35
Missing Value Handling Definition of Missing
User defined missing values are treated as missing.
Cases Used Statistics for each analysis are
based on the cases with no missing or out-of-range data for
any variable in the analysis.
Syntax T-TEST PAIRS=pretest WITH
posttest PAIRED CRITERIA=CI.9500
MISSING=ANALYSIS. Resources
Processor Time 00:00:00,00
Elapsed Time 00:00:00,00
Universitas Sumatera Utara
[DataSet0]
Paired Samples Statistics
Mean N
Std. Deviation Std. Error Mean
Pair 1 Pretest
42,0000 35
12,84523 2,17124
Posttest 84,0000
35 6,61993
1,11897
Paired Samples Correlations
N Correlation
Sig. Pair 1
pretest posttest 35
,042 ,813
Paired Samples Test
Paired Differences Mean
Std. Deviation Std. Error Mean
95 Confidence Interval of the
Difference Lower
Pair 1 pretest – posttest
-42,00000 14,20439
2,40098 -46,87938
Paired Samples Test
Paired Differences t
df Sig. 2-
tailed
95 Confidence Interval of the Difference
Upper
Universitas Sumatera Utara
Pair 1 pretest - posttest
-37,12062 -17,493
34
,000
Paired Sample T-Test showed that the significance value is 0.000. The Determine of Decision:
H is accepted, if significant value alpha value.
H is rejected, if significant value alpha value.
So, the result is Ho is rejected because the significant value alpha value 0.000.05 and 0.00 0.01. It means that H
a
is accepted.
4.4 Findings
