Discuss or explain the following:

1. The role of marketing research in Marketing Management
2. The advantages and drawbacks of questioning and observation as methods of collecting data
3. The difference between stratified random sampling and quota sampling
4. The difference between sampling error and non-sampling error
5. When it would be most appropriate to administer a questionnaire through the personal interview, telephone or mail.
6. Five possible criteria for evaluating secondary data
7. Outline the factors that inhibit the development of marketing research