A pharmaceutical company is testing a vaccine against a virus which is known to be a leading cause of a long-term chroni

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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
(a): Give a 95% confidence interval for the differences in the
proportion of people who are infected with the virus, with and
without the vaccine.
Lower confidence level:
Upper confidence level: