In the Global Youth Tobacco Survey, conducted jointly by the World Health Organization and the US Centers for Disease Control and Prevention (CDC), a random sample of children aged 13 15 in various cities around the world were interviewed to determine the percentage of children in this age group who smoke cigarettes. Among the results for boys in samples taken in major South American cities, the study reported: Buenos Aires, Argentina (21.9% smoke, sample size = 475); Bogota, Colombia (31.0% smoke, sample size = 700); Santiago, Chile (31.3% smoke, sample size = 350) (cdc.gov/tobacco/). Use the chi square test of proportion differences to test the hypothesis that the proportion of boys in this age group who smoke is the same for all three cities. Use a significance level of 5%.
Answer to relevant QuestionsIn a research study conducted to assess how companies view their long term economic prospects, representatives from 50 large companies, 100 midsized companies, and 200 small companies were contacted and interviewed. In the ...In a test of three possible new website designs, Macys. com selected a random sample of 300 online customers. Each customer in the sample was asked to find and purchase a specific list of items within a five minute period. ...For the past 10 years, employment patterns for recent business school graduates have been fairly constant. For example, within the first year after graduation, 23% of students found a job in their major area of study, 38% ...A random sample of 100 baseballs has been selected from each of two large crates of baseballs. One crate of baseballs was produced by Allen Sports Products; the other was produced by Baron Athletic Supply. Ten of the ...The National Forest Service conducted a study of old growth trees in Muir Woods, measuring bark thickness for a sample of 200 old growth redwoods. Sample results are summarized below: The average thickness for the sample was ...
Post your question