8.20. A new graduate hired by the marketing research department of AT\&T is asked to prepare a questionnaire to determine household preferences for cell phone plans. The questionnaire is to be administered in mall-intercept interviews. Using the principles of questionnaire design, critically evaluate the questionnaire prepared by this new graduate, which follows. CELL PHONE PLAN SURVEY 1. Name 2. Age 3. Marital status 4. Income 5. Which, if any, of the following cell phone plans do you have? 1. AT&T2. Verizon 3. Sprint 4. T-Mobile 5. Other(s) 6. How frequently do you use a cell phone to make international calls? Infrequently Very Frequently 1 2 3 4 5 6 7 7. What do you think of the individual cell phone plans offered by AT\&T? 8. Suppose your household were to select a cell phone plan. Please rate the importance of a.n........ fortars in selecting a plan. 9. How important is it for a cell phone company to offer other services, such as Internet access and TV? Not important Very Important 1 2 3 4 5 6 7 10. Do you have children living at home? Thank you for your help