Suppose you are conducting research to find out a great deal of information about the motives and desires of potential customers for a home delivery grocery service. You need a sample of at least 300 subjects who spend $100 or more weekly at the supermarket and you do not have a lot of money to conduct the research. If cost is the number one consideration, you should use:
Mail survey is a quantitative data collection method, mail survey is the pioneer of self-administered questionnaires. Mail surveys need not much of manpower. A man alone can administer the entire survey process.