Volunteer sampling which may produce non-representative samples is a particular problem with

Which of the following programs enjoys the most public support?

a. Medicaid b. Social Security c. No Child Left Behind d. Supplemental Nutrition Assistance Program

The fact that public support for the Korean War declined significantly over a three-year period is evidence __________

a. of the importance of television coverage in turning Americans against the war b. that it was obviously a mistake for the United States to be involved in the Korean War c. that the U.S. government did not do a good enough job selling the war to its citizens d. that television cannot be entirely to blame for declining public support during times of war