Difference in the proportion of smokers

Who Smokes More: Male Students or Female Students? Data 1.1 on page 4 includes lots of information on a sample of 362 college students. The complete dataset is available at Student Survey. We see that 27 of the 193 males in the sample smoke while 16 of the 169 females in the sample smoke. (a) What is the best point estimate for the difference in the proportion of smokers, using male proportion minus female proportion? Which gender smokes more in the sample? (b) Find and interpret a 99% confidence interval for the difference in proportions.