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(2 points) A pharmaceutical company is testing a vaccine against a virus which is known to be a leading cause of a long- term chronic condition. The company conducted four placebo controlled double blind clinical studies of adults ages 16 to 60 to see the effects of the vaccine on the number of reported individuals who were infected with the virus, as well as the number of cases of the chronic condition over a period of two years. The results were Reported Chronic Treatment n Infections Condition Vaccine 8970 10897 18 Placebo 8514 790 10799 (a): Give a 98% confidence interval for the differences in the proportion of people who are infected with the virus, with and without the vaccine. n 165 91 Lower confidence level: Upper confidence level: (b): Give a 98% confidence interval for the differences in the proportion of people who develop the chronic condition with and without the vaccine. Lower confidence level: Upper confidence level: Note: your answers should have at least three significant figures.