Cigarette Consumption. Use the following information for Exercises 65–67. Health officials are interested in estimating the population mean number of cigarettes smoked annually per capita in order to evaluate the efficacy of their antismoking campaign. A random sample of eight U.S. counties yielded the following numbers of cigarettes smoked per capita: 2206, 2391, 2540, 2116, 2010, 2791, 2392, 2692.
Question 8.164
67. Construct and interpret a 90% confidence interval for the population mean number of cigarettes smoked per capita.
8.2.67
(2208, 2576). We are 90% confident that μ, the population mean number of cigarettes smoked per capita, lies between 2208 cigarettes and 2576 cigarettes.