Solve using given information

Ten engineering schools in a country were surveyed. The sample contained 225 electrical engineers, 100 being women; 200 chemical engineers, 50 being women. Compute a 99% confidence interval for the difference between the proportions of women in these two fields of engineering. Is there a significant difference between the two proportions? Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table, Let p, be the population proportion of electrical engineers that are women in the schools that were surveyed and let p2 be the population proportion of chemical engineers that are women in the schools that were surveyed. The 99% confidence interval is