What potential sources of error are associated with the following statements

. In a survey of frequent iers age 50 and older, researchers concluded that price does not play a signicant role in airline travel because only 25 percent of the respondents check off price as the most important consideration in determining where and how they travel, while 35 percent rated price as unimportant. . A survey of voters nds that most respondents do not like negative political adsthat is, advertising by one political candidate that criticizes or exposes secrets about the opponent's \"dirty laundry." . A survey of MySpace users ranks Macbooks as far superior to other PCs for business applications. . Researchers who must conduct a 45-minute personal interview decide that they will offer $10 to each respondent because they believe that people who will sell their opinions are more typical than someone who will talk to a stranger for 45 minutes. . A company's sales representatives are asked what percentage of the time they spend making presentations to prospects, traveling, talking on the telephone, participating in meetings, working on the computer, and engaging in other on-the-job activities. A health insurance company obtains a 75 percent response rate from a sample of college students contacted by mobile-phone in a study of attitudes toward life insurance. . A sample of 14-year-old school children is asked if they have ever smoked a cigarette. The students are asked to respond orally in the presence of other students