The article “Nine Out of Ten Drivers Admit in Survey to Having Done Something Dangerous” (Knight Ridder Newspapers, July 8, 2005) reported the results of a survey of 1100 drivers. Of those surveyed, 990 admitted to careless or aggressive driving during the previous 6 months. Assuming that it is reasonable to regard this sample of 1100 as representative of the population of drivers, use this information to construct a 99% confidence interval to estimate p, the proportion of all drivers who have engaged in careless or aggressive driving in the previous 6 months.
Answer to relevant QuestionsIn a survey on supernatural experiences, 722 of 4013 adult Americans surveyed reported that they had seen or been with a ghost (“What Supernatural Experiences We’ve Had,” USA Today, February 8, 2010). a. What ...The article “Students Increasingly Turn to Credit Cards” (San Luis Obispo Tribune, July 21, 2006) reported that 37% of college freshmen and 48% of college seniors carry a credit card balance from month to month. Suppose ...USA Today (October 14, 2002) reported that 36% of adult drivers admit that they often or sometimes talk on a cell phone when driving. This estimate was based on data from a sample of 1004 adult drivers, and a bound on the ...What is the appropriate t critical value for each of the following confidence levels and sample sizes? a. 95% confidence, n = 17 b. 90% confidence, n = 12 c. 99% confidence, n = 24 d. 90% confidence, n = 25 e. 90% ...Suppose that a random sample of 50 bottles of a particular brand of cough medicine is selected and the alcohol content of each bottle is determined. Let m denote the mean alcohol content (in percent) for the population of ...
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