Which of these survey methods is the most expensive to conduct?

Question

Quizplus · Accepted Answer

Interviews require a trained person to conduct the survey in person, which can be time-consuming and labor-intensive, making it the most expensive method. Phone surveys can also be costly, but they require less manpower and time than interviews. Mail surveys are the least expensive method as they only require printing and postage costs, but they typically have lower response rates.

Which of These Survey Methods Is the Most Expensive to Conduct