Based on a representative sample of 511 U.S. teenagers age 12 to 17, International Communications Research estimated that the proportion of teens who support keeping the legal drinking age at 21 is p^ = 0.64 (64%). The press release titled “Majority of Teens (Still) Favor the Legal Drinking Age” (www.icrsurvey.com, January 21, 2009) also reported a margin of error of 0.04 (4%) for this estimate. Show how the reported value for the margin of error was computed.
Answer to relevant QuestionsA discussion of digital ethics appears in the article “Academic Cheating, Aided by Cell Phones or Web, Shown to be Common” (Los Angeles Times, June 17, 2009). One question posed in the article is: What proportion of ...The two intervals (114.4, 115.6) and (114.1, 115.9) are confidence intervals (computed using the same sample data) for m = true average resonance frequency (in hertz) for all tennis rackets of a certain type. a. What is the ...The authors of the paper “Driven to Distraction” (Psychological Science : 462–466) describe an experiment to evaluate the effect of using a cell phone on reaction time. Subjects were asked to perform a simulated ...Fat content (in grams) for seven randomly selected hot dogs that were rated as very good by Consumer Reports (www.consumerreports.org) is shown below. Is it reasonable to use this data and the t confidence interval of this ...Suppose that each of 935 smokers received a nicotine patch, which delivers nicotine to the bloodstream but at a much slower rate than cigarettes do. Dosage was decreased to 0 over a 12-week period. Suppose that 245 of the ...
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