15. What is an incentive? What types of incentives are there? Under what conditions are incentives effective? Does pre-paying an incentive make a difference in response rates? How much improvement in response rates have been obtained with incentives? What are the pros and cons of using incentives? How do you determine an incentive amount? Can you pay someone too much? (lecture)
16. What is the ideal mailing sequence for maximum response rates to a mail survey thatboth Dillman and Call use? Why do we use multiple mailings? What response rates can you expect for eachmailing? How does the Call method shorten the time it takes to conduct multiple mailings in a mail research design? Which mailing procedure is better? Why? (lecture)