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

 
 
 
 
 
 
 
 
 
 
 
CHAPTER III 
METHODOLOGY OF THE INVESTIGATION 
 
3.1 Investigation type
 
The given paper adheres to quantitative investigation of quasi-
experimental type. The authors Cohen, L. and Manion, L. (1985:274) in 
the book “Research methods in education” state that quasi-experiment 
usually takes place in the “natural setting rather than the laboratory, but 
where variables are isolated, controlled and manipulated
78
”. That means 
that some researches are conducted outside laboratory, moreover, in 
many cases assigning the participants to control and experimental groups 
randomly for the purpose of the investigation seems to be impossible. 
Quasi-experimental type of research allows for “non-equivalent group 
design
79
”, in other words, the pre-test-intervention-post-test is applied to 
control and experimental groups that “have not been equated by 
randomization
80
”. 
As for the given investigation, it was carried out in the classroom 
setting, with two groups of students who were selected by the author as a 
control group and an experimental group (further appears as a sample 
78
Cohen, L. & Manion, L. (1985): 
Research methods in education.
(2 nd. Edn.), 
London: croom Helm.
79
Cohen, L. & Manion, L. (1985). Ibid. p. 283.
80
Cohen, L. & Manion, L. (1985). Ibid. p. 283. 

---

48 
group). The participants were not randomly assigned by the investigator 
to each group before the intervention, but were given to her as groups of 
students to a teacher at the beginning of the semester.