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

3.4.2 Population
At the beginning of a semester each teacher is assigned by the 
university to a number of groups of EFL learners of different levels. In 
order to perform the intervention (Part 2 of the study) , the researcher 
selected two groups of Technical English 1 that she was assigned to teach 
during the semester and randomly chose one group to be the sample and 
the other one to be the control group. There were thirty-four participants 
in total who were engaged into the study with 17 students in each group.
3.4.3 Samples
 
The sample group was chosen randomly by the researcher of the 
investigation. All the participants were either freshmen or sophomore 
Peruvian EFL students ranging in age from 17 to 22 years old, from 
different faculties of the university. The level of linguistic proficiency of 
the participants varied from A 2 to B1 according to the Common 
European Framework of Reference. 
3.4.4 Individuals
All the subjects of the investigation shared similar cultural and 
language background. All of them were native speakers of Spanish 
language of Peruvian variant. All the participants studied English before 
at school, a lot of them travelled to English speaking countries for 
different periods of time and for different purposes.

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3.5 Techniques and instruments for gathering data
3.5.1. Video recording
This qualitative method of data collection was used in the 
investigation at the beginning of the research. Video recording allowed 
the researcher to capture the participants´ English language pronunciation 
in unpretentious classroom atmosphere.
The data gathered by means of video recording was analysed 
inductively. The recording was examined and transcribed phonemically.
Additionally, the examples of phonological interference were classified, 
selected for further investigation and analysed from the point of view of 
phonetics and phonology.