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

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Divergence in Sample group and Control group
Table 11 shows the divergence in the pre-testing average score of 
the sample group and the control group at the beginning of the 
intervention. 
Group 
Average score 
Divergence 
Sample group 
11.82 
Control group 
12.47 
+ 0.65 
Table № 11. Sample group and Control group average score divergence. 
Table 12 demonstrates the average scores and the divergence of 
each case of phonological interference individually in the sample group 
and the control group at the beginning of the intervention. 
Case 
1 
Case 
3 
Case 
5 
Case 
6 
Case 
7 
Case 
8 
Case 
9 
Average 
score SG 
6.76 
5.94 
5.53 
5.88 
5.35 
4.53 
7.41 
Average 
score CG 
7.06 
5.94 
6.41 
5.94 
5.65 
4.47 
8.12 
Divergence 0.3 
0 
0.88 
0.06 
0.3 
0.06 
0.71 
Table № 12. Divergence of the average score of each problem case in Sample and 
Control groups. 
According to Table 11, the divergence of the average score is 0.65 
points, therefore, both groups have approximately the same level of L2 
consonant sounds pronunciation proficiency studied in this investigation. 
Additionally, according to Table 12, the deviation in the scores is quite 
small almost in all cases although the average scores of the control group 
at this stage are somewhat higher than the scores of the sample group. 

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95 
4.1.2 Post-testing results
 
The purpose of the post-testing was to compare and contrast the 
scores of both groups obtained at the beginning and at the end of the 
intervention. Moreover, it was important to witness a progress or lack of 
it in the participant’s pronunciation proficiency level with regards to the 
Case 1, Case 3, Case 5, Case 6, Case 7, Case 8, and Case 9 of 
phonological interference. The learners of both groups were evaluated.