Page 185 - Jurnal Kurikulum BPK 2020

The scatterplot matrices generally moving from left to the top right. So, the assumption
of linear relationship was not violated.

viii. Assumption #8: There is a homogeneity of variance-covariance matrices.
This assumption was tested in SPSS Statistics using Box's M test of equality of
covariance. Since Box’s M (15.68) was significant, p (.278) > α (.001), the assumption
is not violated and thus Wilk’s Lambda is an appropriate test to use.

Table 5
Box’s Tst of Equality of Covariance Matrices a
Table 5
Box's M 15.676
F 1.198
df1 12
df2 13007.526
Sig. .278

ix. Assumption #9: There is no multicollinearity.
The existence of singularity and multicolinearity which create statistical problems to be
a concern can be detected at higher correlation matrix i.e. r=+.8 or r=+.9 and above
(Tabachnick & Fidell, 2013). Based on the correlations among the three test scores were
less than .8 and thus multicolinearity may not be a concern in this dataset.

Table 6
Correlations among the test scores

Post-test 2 Post-test 1 Pre-test
**
**
Pearson Correlation 1 .519 .437
Post-test 2 Sig. (2-tailed) .000 .001
N 56 56 56
**
**
Pearson Correlation .519 1 .713
Post-test 1 Sig. (2-tailed) .000 .000
N 56 56 56
**
**
Pearson Correlation .437 .713 1
Pre-test Sig. (2-tailed) .001 .000
N 56 56 56
Note. **. Correlation is significant at the 0.01 level (2-tailed).

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