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Hi. There are 3 types of interview methods to collect data for your research. Structured interview Semi-structured interview Unstructured interview The difference between the 3 types is that the researcher have set of questions and guidelines in the structured interview for the respondent. The interview is thoroughly professional and point to point with the researcher’s questions. Semi-structured interview involves the researcher to have a set of questions, involving a conversational process with the interviewer to go beyond the specific answers. The responses of the respondent will be strictly related to the questions but may involve the interviewer talking to the interviewee. Unstructured interview is a complete casual interview for the researcher to make the respondent comfortable and answer freely. While the respondent becomes relaxed in this type of interview, the interviewee might have to take 2-3 rounds to find the answers they are looking for. For the geographical location, it will be easier for you to conduct the interview with a small sampling size because going on different locations will only exhaust you and will be costly.

Hi. You can also take a personal interview of your respondent or a group interview to interpret the data out of the answers. Rather you can opt for a different method of collecting data, like questionnaire. The questionnaire will have sufficient amount of questions for the respondents to answer, and will make the analysing process simpler. With interviews, your respondents will provide you with different answers, sometimes, making it difficult for you to come to a definite conclusion.

You can collect samples from different geographical locations with the questionnaire, expanding the sampling size of your research. All you will be doing is dropping a set of questionnaire at their places, through post or by yourself and the data will be easily analysed.

While the method of interviewing solely depends on you, as the researcher, a larger sampling size will make it difficult for you to conduct the interviews. If you are opting for telephonic interview too, the sampling area should be small, in my opinion. With a smaller sampling area, you will able to draw a conclusion for the research, rather than collecting samples from different geographical areas. I think you can read more literature to come to a conclusion on which method of interview will support your hypothesis and your time will not be wasted.