Babkina, V. (2018). Phonological interference of mother tongue over the English

99 
Comparison of pre-testing and post-testing results in Control 
group 
The graph and the table below demonstrate the control group´s pre-
testing and post-testing results in comparison. 
Graph № 8. Control group pre-testing and post-testing results. 
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1
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5
6
7
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9
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15
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CG Pre-testing results
CG Post-testing results

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100 
Control group 
Average score 
Divergence 
Pre-testing
12.47 
Post-testing
12.19 
- 0.28 
Table № 15. Comparison of Control group pre-testing and post-testing average 
score results. 
It is necessary to remind that the control group was not exposed to 
any topic-related pronunciation practice activities and instructions during 
the intervention. Table 15 demonstrates that the control group´s average 
score after post-testing is 12.19 points. Therefore, the control group 
makes evident a slight decrease of 0.28 points in the average score. 
However, Student 2 and Student 12 slightly improved their pronunciation 
of the target sounds. The possible reason for their improvement could be 
the students´ general language aptitude and making a lot of effort to 
study during the semester. Student 16 did not participate in the post-
testing at all due to her constant English class absence. Students 4, 6, 8, 
9, 10, 11, 14 had a decrease in their pronunciation. The score of Students 
1, 3, 5, 7, 13, 15, 17 did not change.
To conclude here, it is important to state that around half of the 
participants of the control group experienced a decrease in their 
pronunciation within the context of the investigation. Other 7 students 
maintained the same score. Only 2 participants slightly improved their 
pronunciation due to other factors which are not the subject of the present 
investigation.

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101 
The graph below presents the comparison of the pre-testing and the 
post-testing results in the control group as regards to each case of 
phonological interference.
Graph № 9. Comparison of pre-testing and post-testing average score 
results of each problem case in Control group. 
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Case 9
Case 8
Case 7
Case 6
Case 5
Case 3
Case 1

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102 
The table below demonstrates the divergence and the average 
scores of each case of phonological interference individually in the 
control group at the beginning and at the end of the intervention.
Table № 16. Control group average scores and divergence for each problem 
case of phonological interference. 
Graph 9 and Table 16 show that there is a slight decrease in the 
average score of each case of phonological interference except for Case 
2. As for Case 6, it shows neither an improvement nor a decline. 
Case 
1 
Case
3 
Case 
5 
Case 
6 
Case 
7 
Case 
8 
Case 
9
CG 
pre-
testing 
7.06 
5.94 
6.41 
5.94 
5.65 
4.47 
8.12 
CG 
post-
testing 
7.0 
6.13 
6.25 
5.94 
5.38 
4.13 
7.81 
Divergence -0.06 
+0.19 
-0.16 
0.00 
-0.27 
-0.34 
-0.31 

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