An advantage of mailed questionnaires is

One advantage of mailed questionnaires is:

Cost-effectiveness: Mailed questionnaires can be a cost-effective way to collect data, especially for large-scale studies or surveys. The cost of printing and mailing questionnaires is often lower than the cost of conducting in-person interviews or online surveys, which can require significant resources and infrastructure. Additionally, mailed questionnaires can be completed at the respondent's convenience, which can reduce the need for interviewer costs and travel expenses.