Cyrus Does Not Like Conducting Interviews In-Person, So He Wanted

Cyrus does not like conducting interviews in-person, so he wanted to use phone interviews for data collection. What types of questions or issues should Cyrus focus on to maximize the benefits of phone interviews relative to face-to-face interviews? (circle all that apply)

A) any illicit behaviors people have engaged in (e.g., drunk driving)
B) the prevalence of certain sexually transmitted diseases
C) attitudes of people who are impoverished and without a high school diploma
D) a representative national sample using random digit dialing