The Institute of Public Health is interested in three tests on the effect of vaccines on children. In a random selection of the vaccinated age group 0-5 years: 200 girls and 300 boys, it was found that 50% of the girls had measles and 58% of the boys had measles.

-The institute declares that the vaccine is equally effective for both sexes. Is the statement of the institute true (=5%, Zkr=1.96)?

-Construct a 95% confidence interval for the difference in the proportions of those affected by measles for both categories (Zkr=1.96)