The article “Irritated by Spam? Get Ready for Spit” (USA Today, November 10, 2004) predicts that “spit,” spam that is delivered via Internet phone lines and cell phones, will be a growing problem as more people turn to web-based phone services. In a 2004 poll of 5500 cell phone users conducted by the Yankee Group, 20% indicated that they had received commercial messages or ads on their cell phones. Is there sufficient evidence to conclude that the proportion of cell phone users who have received commercial messages or ads in 2004 was greater than the proportion of .13 reported for the previous year?
Answer to relevant QuestionsAccording to a Washington Post-ABC News poll, 331 of 502 randomly selected U.S. adults interviewed said they would not be bothered if the National Security Agency collected records of personal telephone calls they had made. ...The report “2007 Electronic Monitoring & Surveillance Survey: Many Companies Monitoring, Recording, Videotaping—and Firing—Employees” (American Management Association, 2007) summarized the results of a survey of 304 ...The paper “Playing Active Video Games Increases Energy Expenditure in Children” (Pediatrics : 534–539) describes an interesting investigation of the possible cardiovascular benefits of active video games. Mean ...A comprehensive study conducted by the National Institute of Child Health and Human Development tracked more than 1000 children from an early age through elementary school (Ne York w Times, November 1, 2005). The study ...The amount of shaft wear after a fixed mileage was determined for each of seven randomly selected internal combustion engines, resulting in a mean of 0.0372 inch and a standard deviation of 0.0125 inch. a. Assuming that the ...
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