Dr. Bermerge must design a survey of a national sample. The survey must include many questions, some of them complex with multiple branches and some of them of little interest to respondents. The questions do not tend to deal with personal or intimate matters. What would be the most advantageous survey design for achieving these goals?

In-person interview.

Explanation:

In-person interview: In research methods, the term "in-person interview" is described as a phenomenon in which the researcher or the investigator is involved in "face-to-face" meeting with the participants or interviewee involved in a research study. An in-person interview is often considered as a "traditional mode" of the interview that various companies are following before any emergence of a specific technology.

In the question above, the given statement signifies the "in-person interview".