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Previous Problem Problem List Next Problem iii ! A supermarket manager wishes to make an estimate of the average time in minutes a customer spends at the checkout counter. It is known from previous studies that the variance is 10.7. How large a sample is required if she wants a 95% confidence interval for the population mean that extends no further than 1 minutes from the sample mean. Round up your answer to a whole number. Previous Problem Problem List Next Problem #5 (1 point) A government official is in charge of allocating social programs throughout the city of Vancouver. He will decide where these social outreach programs should be located based on the percentage of residents living below the poverty line in each region of the city. He takes a simple random sample of 123 people living in Gastown and finds that 21 have an annual income that is below the poverty line. Part i) The proportion of the 123 people who are living below the poverty line, 21/123, is a: DA. variable of interest. O B. statistic. O C. parameter. Part ii) Use the sample data to compute a 95% confidence interval for the true proportion of Gastown residents living below the poverty line. (Please carry answers to at least six decimal places in intermediate steps. Give your final answer to the nearest three decimal places). 95% confidence interval = ( , ) Previous Problem Problem List Next Problem %: [6 (1 point) Andrew thinks that people living in a rural environment have a healthier lifestyle than other people. He believes the average lifespan in the USA is 77 years. A random sample of 17 obituaries from newspapers from rural towns in Idaho give 5c 2 80.07 and s = 2.48. Does this sample provide evidence that people living in rural Idaho communities live longer than 77 years? (a) State the null and alternative hypotheses: (Type "mu" for the symbol [1 , e.g. mu >1 for the mean is greater than 1, mu