Felicia has mailed out a series of questions to all the patients she saw in the last year, asking about their quality of care, diagnoses, current health, etc. The results are anonymized, so Felicia will never know which patients are connected to which set of responses. What is the best description of Felicia's actions?

Question

conducting a focus group

conducting multiple interviews

using a questionnaire

engaging in observation

Answer 1

using a questionnaire